The journey through pregnancy is often described as a series of exciting milestones, each week bringing new developments for both you and your growing baby. As you transition from the initial, often challenging, phase of the first trimester, a new chapter begins – the second trimester. For many, this period, spanning from week 13 through week 27, is frequently referred to as the ‘honeymoon phase’ of pregnancy. The intense nausea and fatigue that might have defined your earlier weeks often start to subside, replaced by a renewed sense of energy and a blooming anticipation for what’s to come. This phase is characterized by significant fetal growth, noticeable changes in your body, and a variety of new symptoms, some surprising, some welcome. The video above offers a fantastic week-by-week overview of what to expect, and this article aims to expand on those insights, providing a comprehensive guide to navigating your second trimester with confidence and knowledge.
Embracing the “Honeymoon Phase”: Weeks 13-17
As you enter the second trimester of pregnancy, a multitude of changes are underway. Your baby is developing rapidly, and your body is also adapting in remarkable ways. This period, often marked by a boost in energy, allows many expectant mothers to truly savor the experience.
1. Week 13: A Cookie-Sized Milestone
At 13 weeks, your baby is approximately the size of a cookie. Significant developmental strides have been made; the arms have achieved proportional length, though the legs are still catching up. A fascinating process occurring internally is the production and excretion of urine into the amniotic fluid, a crucial step for kidney development. Furthermore, your baby is beginning to form unique fingerprints, an incredible detail even at this early stage. As for you, while some women might have gained upwards of 5 lbs in the first trimester, it is common for weight gain to accelerate now, with most individuals typically gaining about 1 pound per week, accumulating roughly 15 lbs throughout the second trimester. It is worth noting that the old adage of ‘eating for two’ is a myth; approximately 300 extra calories per day, equivalent to a piece of fruit and a cup of yogurt, are generally sufficient to support your pregnancy.
One common, yet often overlooked, symptom that may arise is nasal congestion, affecting around 40% of pregnant women. This condition, known as rhinitis of pregnancy, is often attributed to elevated estrogen levels, which cause mucous membranes to swell and produce more mucus. Unlike a cold or allergies, it typically presents without other symptoms. Safe relief methods are available and may include:
- Rinsing nasal passages with saline water.
- Taking warm, steamy showers.
- Using over-the-counter saline nose drops or a vaporizer.
- Employing an extra pillow to elevate your head at night.
The importance of proper sleep positioning cannot be overstated. While not universally agreed upon by all experts, it is often recommended to avoid sleeping on your back during the second and third trimesters. This position can place undue pressure on the inferior vena cava, a major vein, potentially interfering with digestion and circulation, causing backaches, and reducing blood flow to the fetus. The optimal sleeping position is generally considered to be on the left side, as this supports superior blood flow. Many expectant mothers find comfort and support when sleeping on their sides with a thick pillow between their knees or utilizing a full-body pregnancy pillow.
2. Week 14: The Pickle Phase
By week 14, your baby has grown to the size of a pickle. A fine layer of hair, called lanugo, begins to cover the skin, serving to protect and insulate. This lanugo will usually be shed as the baby gains more fat in the later stages of pregnancy, though some babies born prematurely may still have it. For the mother, breast tenderness from the first trimester often subsides, but other changes occur, such as the darkening and enlargement of the areolas. The growing uterus and increased progesterone levels also contribute to the gradual stretching of pelvic bones and the expansion of the abdomen. This can lead to round ligament pain, which is frequently described as a dull ache around the hips or sharp pains upon changing positions. Should these sharp pains persist for more than a few seconds or intensify, medical advice from your doctor or midwife is recommended.
Increased susceptibility to urinary tract infections (UTIs) is another concern due to the uterus pressing on the bladder, hindering complete emptying. Preventive measures are straightforward:
- Drink ample water.
- Urinate before and after sexual activity.
Symptoms such as a burning sensation during urination warrant a doctor’s visit, as untreated UTIs can lead to serious complications including kidney infections and preterm labor. Similarly, elevated estrogen levels increase the risk of yeast infections. Reducing this risk can involve:
- Wearing cotton-crotch underwear.
- Sleeping without underwear.
- Opting for showers over baths.
Another surprising but common symptom is bleeding gums, known as pregnancy gingivitis, caused by hormonal changes that make gums more sensitive and prone to inflammation. Sleep disturbances can also become more prevalent, often due to heartburn, anxiety, and frequent trips to the restroom. Strategies for improving sleep quality include:
- Engaging in exercise earlier in the day.
- Limiting screen time before bed.
- Sleeping in a cool, dark room.
It is also important to remember that the immune system is suppressed during pregnancy, making the flu shot a safe and recommended preventive measure, which also offers a bonus of transferring antibodies to the baby post-birth.
3. Week 15: The Tomato Transformation
At 15 weeks, your baby is comparable in size to a tomato. Facial expressions are actively practiced, from frowning to grimacing, and the hands are forming fists and grasping. Hearing also begins to develop; the baby can discern internal sounds like your heartbeat and the rush of blood, and importantly, your voice. Studies have indicated that newborns show a preference for their mother’s voice, highlighting the significance of speaking to your baby during pregnancy.
Many women experience the coveted ‘pregnancy glow’ around this time, a result of increased blood flow and oil production, leading to rosier cheeks and thicker hair and stronger nails. However, it is acknowledged that this ‘glow’ is not universal, and some women may experience less favorable changes. A more serious symptom that may emerge is prenatal depression, which affects up to 23% of women, manifesting as difficulty concentrating, sadness, or anxiety that impacts daily life. If such symptoms are a concern, it is vital to discuss them with a healthcare provider, as support groups, cognitive behavioral therapy, and certain antidepressants are available treatments.
Between week 15 and week 20, screening tests for neural tube defects, such as a quad screen or integrated biochemistry, become available. These tests assess the likelihood of conditions like spina bifida and anencephaly and can also indicate the risk of chromosomal differences like Down Syndrome. While these screenings do not provide a definitive diagnosis, they offer valuable information for further investigation. A crucial practical step at this stage is to identify a doctor for your baby; this can be a pediatrician or a family doctor, and often, your existing primary care provider may be able to accept your baby as a patient.
4. Week 16: Doughnut-Sized Delights and Developing Ovaries
By 16 weeks, your baby is roughly the size of a doughnut and is making voluntary movements, potentially even sucking a thumb. Remarkably, if you are expecting a girl, her tiny ovaries are beginning to develop hundreds of thousands of eggs. Externally, your belly may become noticeably prominent, or ‘pop,’ during this stage of the second trimester. While your baby has been moving for some time, it is often around week 16 that these movements, sometimes described as ‘flutters,’ become perceptible to the expectant mother. It is worth noting that if movements are not consistently felt, it is not always a cause for concern, as babies sleep frequently, and the placenta’s position can also muffle sensations.
Back pain is a highly prevalent discomfort during pregnancy, primarily caused by relaxing ligaments, increased weight from the belly and breasts, and the separation of abdominal muscles to accommodate the growing uterus. This lack of lower back support contributes significantly to soreness. Countering back pain can involve:
- Maintaining good posture.
- Wearing low-heeled shoes.
- Sleeping on your side.
- Staying physically active.
If the pain persists, alternative therapies such as acupuncture and massage may be beneficial. A feeling of clumsiness is also a common complaint, and it is not imagined. The shifting center of gravity, coupled with fatigue and the inability to see one’s feet, increases the likelihood of falls. In fact, pregnant women are considered as prone to tumbles as 70-year-olds. Practical steps to enhance safety include:
- Wearing flat, grip-soled shoes.
- Using handrails on stairs.
- Treading carefully.
To alleviate both physical discomforts and emotional stress, prenatal yoga is often recommended. Its exercises can help manage back pain, headaches, anxiety, and sleeplessness, and the breathing techniques can prepare for later stages of pregnancy and labor. It is crucial to find an instructor experienced with pregnant women.
5. Week 17: The Taco Transformation
At 17 weeks, your baby is comparable in size to a taco and is starting to accumulate fat, becoming more ‘squishable.’ Eyelashes and eyebrows are also beginning to grow. For the mother, an increased appetite is often noticed, commonly referred to as being ‘capital-H hungry.’ The growing belly and breasts continue to expand, leading to skin stretching and potential itchiness, for which frequent moisturizing is advised. Other common symptoms include heartburn, indigestion, increased vaginal discharge, and heightened sweating due to increased blood flow – sometimes jokingly referred to as another aspect of the ‘pregnancy glow.’
A curious fact is that the placenta will develop approximately 50 kilometers of blood vessels throughout pregnancy, highlighting its immense and vital function. If fetal movements are already being felt, you might observe that the baby responds to sounds or certain foods you consume. Pregnancy headaches are also a common and annoying symptom, primarily attributed to hormonal fluctuations. Prevention and relief strategies include:
- Prioritizing sufficient sleep.
- Staying well-hydrated.
- Eating regular snacks.
- Taking a nap or drinking water to reduce severity.
- Using acetaminophen in lower doses, which is generally considered safe during pregnancy.
This period also marks an opportune time to discuss post-baby life logistics with your partner, including division of household chores, cooking, night feedings, and decisions regarding co-sleeping or sleep training. Open communication now can help establish realistic expectations later. Considering a baby and toddler CPR/first aid class is also highly recommended at this stage, before your belly becomes too large to comfortably practice techniques on mannequins. Such classes provide essential skills for responding to choking, performing CPR, and managing cuts and scrapes, offering invaluable peace of mind for new parents.
Mid-Trimester Momentum: Weeks 18-22
The middle of your second trimester sees continued growth and development for your baby, while your body becomes increasingly adjusted to pregnancy, though new challenges and opportunities for preparation also emerge.
1. Week 18: The Large Cupcake Connoisseur
By 18 weeks, your baby is the size of a large cupcake. Taste buds are developing, allowing the baby to sample flavors from your diet through the amniotic fluid. This early exposure is believed to influence future food preferences, suggesting that a varied diet during pregnancy can encourage better eating habits in toddlers. You are now officially four months pregnant, with your uterus roughly the size of a cantaloupe. This growth often contributes to backaches and shifts in your center of gravity, which can make routine household tasks involving bending or balancing more challenging.
Some pregnant women may experience feelings of faintness or dizziness. This is often caused by extra progesterone, which relaxes blood vessels, and increased blood flow directed to the baby, leading to a drop in blood pressure. Managing these symptoms involves:
- Resting as needed.
- Ensuring adequate iron intake through foods like meat, fish, poultry, beans, and lentils.
Between week 18 and week 20, the anatomy scan ultrasound is typically performed. It is critical to attend this appointment with a full bladder, as this helps to push the uterus into the pelvis for optimal visualization of the baby. While providing an opportunity to discover the baby’s sex if desired, the primary importance of this hour-long scan is to detect any developmental or anatomical issues and to confirm the baby’s growth is on track. Many problems identified in utero can be managed during pregnancy or soon after birth, highlighting the scan’s significance for early intervention.
2. Week 19: The Mango Movement
At 19 weeks, your baby is the size of a mango. A white, waxy substance called vernix caseosa begins to coat the baby’s skin. This protective layer helps regulate body temperature and shields the delicate skin from the acidic amniotic fluid, preventing it from becoming overly dry or pruney. Fetal movements are gradually increasing, often described by first-time mothers as feeling like butterflies or a wriggling goldfish. If movements are not yet felt, it is common and should not be a cause for worry, as the sensations become more distinct as the baby grows larger in subsequent weeks.
As the body expands, round ligament pain, characterized by sharp pains in the hips and groin, and a persistent achy lower back, can become more prominent. Prenatal yoga, stretching, and meditation are often found helpful in managing these discomforts. Dizziness and lightheadedness may also become more frequent as the baby presses on blood vessels and crowds the lungs, potentially making breathing more difficult. Achieving comfortable sleep can be a challenge with a growing belly; sleeping on your side with bent knees, using creative pillow arrangements, or investing in specialized pregnancy pillows, are often recommended strategies. Skin changes, such as brownish, confetti-like patches on the face, known as chloasma or “the mask of pregnancy,” are common, especially in women with darker skin tones. These are caused by increased melanin production due to rising estrogen levels and typically fade after pregnancy. Protecting exposed skin with high SPF sunscreen is crucial to minimize potential permanent damage, as pregnant skin is more susceptible to sunburn.
This period is also a vital time for practical preparations. It is highly advised to create or update a will, particularly to designate a guardian for your children and an executor to manage finances. On a lighter note, thinking about baby necessities and creating a registry can begin now, with friends and family often willing to loan items or provide larger gifts.
3. Week 20: Halfway to Happiness – The Bread Slice
Reaching week 20 signifies the official halfway point of your pregnancy, with your baby now the size of a slice of bread. The baby is developing regular sleep-wake patterns, actively building muscle, and refining coordination through flexing, kicking, and flipping. By this stage, your pregnancy is unmistakably visible, and if increased energy has not yet arrived, it is often expected to as you enter the “honeymoon phase.”
An increase in vaginal discharge is common and will likely continue to progress throughout pregnancy, serving as the body’s natural cleansing mechanism. However, if an odor or yellowish tinge is observed, it could indicate a yeast infection, and consultation with a healthcare provider is advised. Your breasts may also begin to “fire up,” producing colostrum—a yellow, nutrient-rich substance that precedes breast milk. Nipple discharge is entirely normal at this stage. Emotional adjustments may also be part of this period; if the baby’s sex was revealed during the anatomy scan and it wasn’t what was hoped for, it is natural to experience disappointment. Time allows for acceptance and excitement to grow, ultimately leading to infatuation upon meeting your little one.
Concerns about weight gain commonly arise around week 20. The general aim is to gain just over one pound per week from this point forward. While a nutritious diet is paramount for a healthy pregnancy, it is also important to practice self-compassion. The primary goal is to nurture a healthy human being, not to adhere to unrealistic body image standards.
4. Week 21: The Popsicle Performer
By week 21, your baby is the size of a popsicle. Crucial connections between the brain and muscles are forming, leading to enhanced control over movements—explaining those late-night “dance parties” felt in the womb. Your baby is also practicing swallowing and digesting amniotic fluid, tasting the various flavors from your diet. Research suggests that exposure to a wider variety of flavors in utero can lead to children being less picky eaters, encouraging expectant mothers to consume a diverse range of healthy foods.
As your bump continues to grow, stretch marks may appear on the breasts, stomach, thighs, hips, and bum. Approximately half of all mothers-to-be will experience stretch marks, which can range in color from pink to red or purple and are often more visible in fair-skinned individuals. Genetic predisposition, such as whether your own mother experienced them, also plays a role. While largely beyond control, rapid weight gain can exacerbate their appearance. Although no surefire prevention method exists, many women attest to the benefits of belly butters and oils, which, at a minimum, can help alleviate the dry and itchy skin associated with stretching. The good news is that these marks typically fade after delivery. Attending prenatal classes with your partner or delivery-room support person is highly beneficial. These classes cover pain management techniques for labor, newborn care basics including swaddling, bottles, and breastfeeding, and can significantly boost confidence for both parents. Furthermore, if a baby shower is planned, this is an ideal time to set a date, particularly to accommodate out-of-town guests.
5. Week 22: The Hot Dog Hustle and Hormonal Shifts
By the end of week 22, you officially reach five months pregnant, with your baby now comparable in size to a hot dog. The increasing size of the baby places considerable strain on your body, emphasizing the importance of self-care. Prioritizing rest, indulging in soothing baths for aching muscles and joints, and elevating your feet are crucial, especially if you are experiencing pregnancy edema, or swelling.
Pregnancy edema, caused by an increased volume of fluid in the body, is a very common occurrence, manifesting as swollen feet, particularly after standing, and puffy hands. A practical tip is to remove rings now if they feel tight, before swelling makes it impossible. While minor swelling is normal, sudden or severe swelling, especially in the face, can be a warning sign of preeclampsia, a potentially dangerous complication requiring immediate medical attention. Swelling is not the only reason shoes might feel snug; the hormone relaxin, responsible for loosening pelvic ligaments for delivery, also affects ligaments in the feet, causing bones to spread. Many women experience an increase of a half to a full shoe size, which often remains post-pregnancy.
Some expectant mothers report a surge in libido around this time, which is not surprising given fluctuating hormones and the positive attention received with a growing bump. This stage also brings increased focus on birth planning. Decisions regarding delivery location—home, hospital, or birthing center—and preferred pain management options, such as medication, massage, breathing techniques, or tub soaking, begin to take shape. For low-risk pregnancies without complications like preeclampsia or gestational diabetes, home birth can be a viable option, offering the comfort of one’s own environment and potentially fewer medical interventions. However, certain conditions, such as previous C-sections or carrying multiples, necessitate a hospital delivery. This period is also an excellent time to consider a “babymoon,” a mini-holiday before the baby arrives, as flying is generally safe until weeks 34 to 36 (though airline policies should be checked). Additionally, the end of the second trimester is often considered the ideal time for a maternity photoshoot, capturing the beauty of your prominent belly.
Approaching the Third Trimester: Weeks 23-27
As the second trimester draws to a close, your baby is preparing for rapid growth, and your body is fine-tuning its preparations, bringing with it a unique set of symptoms and important considerations for the final stretch.
1. Week 23: The Carrot Capriccio and Body Changes
By week 23, your baby is approximately the size of a carrot. For the mother, varicose veins, characterized by bluish or purplish bulging veins on the legs, may become apparent. These are caused by the increasing weight of the uterus exerting pressure on lower body veins, combined with an increased blood volume and hormone-induced vein dilation. Genetics often play a role in their development. While complete prevention is difficult, managing them can involve:
- Avoiding prolonged standing.
- Not crossing your legs.
- Elevating your feet whenever possible.
- Wearing compression socks or tights to improve circulation.
Fortunately, varicose veins often diminish after delivery. Linea nigra, a dark line that appears vertically on the abdomen, is another common skin discoloration caused by pregnancy hormones and will also fade postpartum. “Baby brain,” or absentmindedness and forgetfulness, is a recognized physiological symptom attributed to pregnancy hormones. To cope with this temporary condition:
- Set appointment reminders on your phone.
- Leave yourself notes.
- Maintain a to-do list.
Self-compassion during this period is key.
2. Week 24: The Burrito Baby and Screening Season
At 24 weeks, your baby is the size of a burrito, measuring about 30 cm (12 inches) long and weighing roughly 1.5 lbs. Fetal features are becoming increasingly defined, with fine eyelashes and eyebrows, and the initial growth of hair. The baby’s hearing is well-developed, able to discern various sounds from within and outside the womb. Capillaries are forming, making the skin less translucent and giving it a pinker undertone due to circulating blood.
Achy legs are common at this stage, frequently signaling dehydration but occasionally pointing to a nutritional deficiency. It is always wise to mention persistent aches to your practitioner. Strategies for relief include:
- Drinking plenty of water.
- Staying active.
- Stretching regularly.
Carpal tunnel syndrome, characterized by tingling or numbness in the wrists and fingers, can occur in pregnancy due to fluid buildup pressing on the nerve in the wrist. Repetitive motions can exacerbate it, and symptoms may worsen at night. Managing this involves:
- Propping hands on pillows at night.
- Stretching hands and wrists during the day.
This is also the typical time for a gestational diabetes screening test. This test evaluates how the body processes sugar after consuming a very sweet liquid, with blood drawn about an hour later. Gestational diabetes occurs when the pancreas cannot produce enough insulin to manage blood glucose levels, increasing risks of preterm birth, preeclampsia, and a very large baby, potentially necessitating a C-section. Abnormal results require further testing for diagnosis. Management typically involves dietary adjustments. Preparing for childbirth is a significant mental undertaking; while prenatal classes and reading can provide knowledge, it is important to remember that each birth experience is unique and may not unfold as expected. Discussions with friends who have given birth can be reassuring, but being prepared for potentially graphic details is advisable.
3. Week 25: The Milk Carton Miracle and Heartburn Havoc
By 25 weeks, your baby is the size of a carton of milk. Skin continues to pinken as blood vessels develop, and fat accumulation continues. The nose is now functional, allowing the baby to take practice “breaths” of amniotic fluid. Heartburn is a very common complaint for many women at this stage, attributed to the hormone relaxin loosening the muscle at the top of the stomach, allowing stomach acids to reflux into the esophagus. This can cause painful heartburn after meals and when lying down. Effective management strategies include:
- Avoiding greasy and spicy foods.
- Opting for smaller, more frequent meals.
- Stopping eating several hours before bedtime.
- Elevating your upper body to sleep.
- Using calcium-based chewable antacids if approved by your practitioner.
Hemorrhoids, a form of varicose veins in the rectum, affect more than half of mothers-to-be, caused by increased blood flow and uterine pressure. Immediate relief can be found with ice packs and witch hazel “padsicles.” Some medicated creams are typically safe, but pharmacist consultation is recommended. Constipation is another frequent issue, and increasing fiber intake (fruits, vegetables, whole grains) and drinking plenty of water can help prevent straining and associated pain. Persistent constipation should be mentioned to your practitioner, as it can sometimes indicate nutritional deficiencies.
4. Week 26: The French Fry Finale and Finishing Touches
As you approach the end of the second trimester, at week 26, your baby is as large as a big side of fries. The baby’s eyes are forming and will soon open, and the immune system is actively developing, absorbing your antibodies in preparation for life outside the womb. A noticeable sleep-wake pattern for your baby often emerges, with periods of active kicking followed by quiet times of sleep. Headaches can become more frequent, often linked to stress, hormone fluctuations, dehydration, and hunger. Preventive measures and relief options include:
- Carrying a water bottle and sipping frequently.
- Eating every few hours.
- Taking occasional acetaminophen (avoid chronic use).
- Exploring drug-free pain relief like acupuncture, massage, and meditation.
Any persistent headache, especially when combined with blurry vision, sudden swelling, or upper abdominal pain, warrants immediate contact with your practitioner, as these could be signs of preeclampsia. Foot swelling and an increase in shoe size due to relaxin’s effect on foot ligaments remain common. A spike in libido is also reported by some at this time due to hormonal changes and increased body confidence.
Final considerations for this stage include making decisions about your birth plan, including your preferred delivery location and pain management options. If you are contemplating a “babymoon,” now is an ideal time, as most airlines permit flying until weeks 34-36. Additionally, if a maternity shoot is on your mind, the end of the second trimester is often considered the best time to showcase your bump.
Growing Wonders: Your Second Trimester Q&A
What is the second trimester of pregnancy?
The second trimester is the middle phase of pregnancy, lasting from week 13 through week 27. It’s often called the ‘honeymoon phase’ because intense nausea and fatigue from the first trimester usually subside, and energy returns.
How does the baby develop during the second trimester?
During this trimester, the baby grows rapidly, developing unique fingerprints, practicing facial expressions, and starting to hear sounds like your voice. They also begin to make voluntary movements, and organs continue to mature.
What are some common body changes a pregnant person might notice in the second trimester?
You might experience increased energy, a noticeably growing belly, and possibly a ‘pregnancy glow’. Other common symptoms can include nasal congestion, round ligament pain, backaches, and sensitive gums.
Are there any important medical appointments or tests during the second trimester?
Yes, a significant one is the anatomy scan ultrasound, usually between weeks 18-20, to check the baby’s development. You will also typically have a gestational diabetes screening around week 24.
What are some ways to stay comfortable and healthy during the second trimester?
It’s recommended to sleep on your side, stay hydrated, maintain good posture, and eat regularly to manage symptoms. Activities like prenatal yoga can also help with discomfort and stress.
