GUIDE
Your baby's five senses are fully functional and brain connections are forming rapidly.
At 31 weeks your baby is the size of a coconut, weighing about 3.3 pounds. All five senses are now working — your baby can see, hear, taste, touch, and smell. Brain development is in overdrive, forming trillions of connections that will support learning and development after birth.
Be prepared from day one
Your baby is now about the size of a coconut — roughly 16.2 inches long and weighing approximately 3.3 pounds. This week marks a sensory milestone: all five of your baby's senses are now fully functional.
Your baby can see light and shadow through the uterine wall. Their pupils respond to light by dilating and constricting. They can hear your voice, your partner's voice, your heartbeat, and sounds from outside. They can taste the amniotic fluid (which changes flavor based on what you eat). They respond to touch — pressing on your belly may get a kick or nudge in return. And their sense of smell is developed, ready to recognize you immediately after birth.
The brain is the star of the show at 31 weeks. Neural connections are forming at an astonishing rate — trillions of synaptic connections that will form the foundation for learning, memory, and behavior. The brain is growing so fast that it's starting to outgrow the skull, which is why the surface wrinkles into those characteristic folds.
Your baby is also practicing breathing movements more consistently now. These aren't real breaths — your baby is surrounded by fluid, not air — but the rhythmic expansion and contraction of the chest muscles and diaphragm is essential practice for that first breath after delivery. You may feel these as gentle, rhythmic movements that are different from kicks.
Fat continues to accumulate under the skin. Your baby is looking less translucent and more like a newborn every day, with skin becoming pinker and smoother as fat fills out the wrinkles.
At 31 weeks you may notice a new addition to the symptom roster: leaking colostrum. This thick, yellowish fluid is the precursor to breast milk, packed with antibodies and nutrients. Not everyone experiences leaking this early, and whether or not you leak has no bearing on your ability to breastfeed later. If leaking is bothersome, nursing pads can help.
You might be feeling increasingly clumsy. This isn't in your head — your center of gravity has shifted dramatically, the hormone relaxin is loosening your joints, and your growing belly makes it harder to see your feet. Be mindful on stairs and uneven surfaces.
Braxton Hicks contractions are likely a regular occurrence now. These practice contractions can be uncomfortable but shouldn't be painful. They tend to be triggered by dehydration, a full bladder, physical activity, or even the baby's movements.
Sleep quality continues to decline for most pregnant people at this stage. Between bathroom trips, difficulty finding a comfortable position, vivid dreams, and anxiety about the approaching birth, getting restful sleep is genuinely challenging. Do what you can — naps count.
Back and pelvic pain may be increasing as your joints loosen and your body adapts to the extra weight. A maternity support belt, warm baths, and gentle stretching can help. Avoid heavy lifting and be careful with how you move — bend at the knees, not the waist.
Heartburn and acid reflux are also common at 31 weeks as your uterus pushes against your stomach. Eating smaller meals and avoiding lying down right after eating can help manage the discomfort.
Every pregnancy is different. You may experience all, some, or none of these symptoms.
Nine weeks to go. The balance between preparing and resting is key right now — push yourself to check things off the list, but also give yourself permission to slow down.
By now your baby has developed regular sleep-wake cycles. You'll start to notice when they're most active. Continue your daily kick counts and get to know your baby's unique schedule. A change in pattern — not just a quiet hour — is what you're watching for.
Whether it's deep breathing, progressive muscle relaxation, meditation, or prenatal yoga, finding a relaxation method that works for you now will serve you well during labor. Many of these techniques are taught in childbirth classes and can help manage anxiety about the upcoming birth.
If sleep is becoming a real struggle, try these strategies: keep a consistent bedtime, limit fluids in the evening (but stay hydrated during the day), use pillows to support your belly and between your knees, keep the room cool, and avoid screens before bed. Talk to your provider if insomnia is affecting your daily functioning.
If you haven't started yet, begin collecting the basics: diapers, onesies, a safe sleep space, a car seat (required to leave the hospital), and feeding supplies. You don't need everything on every baby registry list — focus on what you'll actually use in the first few weeks. It's also not too early to start thinking about your hospital bag.
When in doubt, call your provider. It's always better to check and be reassured than to wait and worry.
Next week at 32 weeks, your baby will be the size of a squash and gaining about half a pound per week. Most babies are head-down by 32 weeks, settling into position for delivery. Toenails will be visible, and your baby's practice breathing will become more consistent.
If you're looking back, week 30 covered the lanugo shedding and bone marrow transition. And if swollen feet are driving you crazy, know that this is one of the most common — and most annoying — third trimester symptoms.
You're doing great. Nine weeks might feel long, but your baby is making incredible progress every single day.
This guide is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider with any questions about your pregnancy.
