Week 28
Your baby is the size of an eggplant
What's happening this week
Welcome to the third trimester — the final leg of your pregnancy journey. Your baby is nearly 15 inches from head to toe and weighs about 2.5 pounds. From this point forward, the primary focus of development is growth and maturation, preparing your baby for life outside the womb.
A significant milestone this week: your baby's central nervous system is now mature enough to control body temperature. This is a critical capability for survival after birth. The fat layer beneath the skin continues to thicken, providing additional insulation.
Your baby's eyelids can now partially open, and the eyes are beginning to produce tears. The pupils can react to light — dilating in darkness and constricting in brightness. Vision is the last sense to fully develop, and your baby is practicing the visual processing skills they'll need after birth.
Breathing movements are becoming more rhythmic and can be seen on ultrasound. Your baby is practicing breathing by moving the diaphragm and expanding the lungs with amniotic fluid. These practice sessions strengthen the muscles and pathways needed for that first breath.
The brain is growing rapidly, adding new neurons and forming connections at an extraordinary rate. The surface area of the brain is increasing as more folds develop. Brain weight will nearly triple between now and birth.
If born now, your baby would have an excellent chance of survival — survival rates at 28 weeks are approximately 90-95% with NICU care. Every additional week in the womb improves outcomes, but the viability milestone has been thoroughly crossed.
Your body this week
The third trimester has officially begun, and your body knows it. The next 12 weeks are about the final push — literally and figuratively — as your baby grows from 2.5 pounds to their birth weight of roughly 6-9 pounds.
Your prenatal visits will likely increase to every two weeks starting now, and will shift to weekly visits around week 36. Your provider is monitoring your blood pressure, baby's growth and position, and watching for any signs of complications like preeclampsia or gestational diabetes.
If you're Rh-negative (a blood type characteristic), you'll receive a RhoGAM injection around week 28. This prevents your immune system from producing antibodies against your baby's blood if it's Rh-positive — a condition called Rh incompatibility. It's a standard, safe, and important preventive measure.
Physically, you may be feeling the full constellation of third-trimester symptoms: persistent back pain, heartburn, frequent urination, Braxton Hicks contractions, difficulty sleeping, swollen feet and ankles, and shortness of breath. None of these are pleasant, but they're all your body doing exactly what it needs to do to grow a human.
Kick counting should now be part of your daily routine. Track 10 movements within 2 hours during a time your baby is typically active. Getting to know your baby's normal movement patterns is one of the most important things you can do in the third trimester — a change in pattern warrants a call to your provider.
Emotionally, third-trimester nesting instincts may kick in — a sudden urge to organize, clean, and prepare your home. Channel this energy into practical tasks: finishing the nursery, washing baby clothes, packing the hospital bag, and installing the car seat.
For dads
The third trimester is here, and the countdown is real. Twelve weeks sounds like a long time, but it goes faster than you expect — and the last few weeks can be unpredictable if your baby decides to arrive early. Use this week to audit your readiness: car seat installed (and inspected if possible), hospital bag started (hers and yours — don't forget a change of clothes, snacks, and phone charger for yourself), pediatrician selected, birth plan discussed, and work leave arranged. If the car seat isn't installed yet, do it this weekend. Seriously. Installing a car seat correctly is harder than it looks, and you don't want to be figuring it out in the hospital parking lot while your partner and newborn wait.
Your partner is entering the hardest physical stretch of pregnancy. The baby is big enough to cause real discomfort — pressure on the bladder, difficulty breathing, back pain, and interrupted sleep are daily realities now. She may be less patient, more tired, and more emotional. This is not the time to pull back on support — it's the time to step up. Cook dinner without being asked. Handle the household tasks she's been managing. Offer a foot rub without expecting anything in return. And when she says she's miserable, believe her — don't try to silver-lining it. Sometimes 'that sounds really hard, and I'm here' is exactly what she needs to hear.
Common concerns
What is the RhoGAM shot and do I need it?+
RhoGAM is given to pregnant people who are Rh-negative (a blood type characteristic) around week 28 and again after delivery. If your baby has Rh-positive blood, your immune system could potentially produce antibodies that would attack the baby's red blood cells — a condition called Rh incompatibility. RhoGAM prevents this by blocking antibody production. It's a standard, safe injection that protects both this pregnancy and any future pregnancies. Your provider determined your Rh status from blood work done at your first prenatal visit.
How much should the baby be moving at 28 weeks?+
By 28 weeks, most providers recommend daily kick counting. The standard guideline is to feel 10 movements (kicks, rolls, punches, or hiccups) within 2 hours during a time your baby is typically active. Most babies reach 10 movements well within that window. The key is establishing what's normal for YOUR baby and watching for changes in that pattern. If you don't reach 10 in 2 hours, try eating something cold or sweet, changing positions, and counting again. If movement is still significantly decreased, contact your provider.
Is nesting instinct a real thing?+
Yes — nesting is a well-documented phenomenon in late pregnancy. Many people experience a sudden surge of energy and an intense urge to clean, organize, and prepare their home for the baby. It can manifest as deep-cleaning the kitchen at midnight, obsessively organizing the nursery closet, or suddenly needing to wash every piece of baby clothing. It's thought to be driven by hormonal changes and the psychological preparation for parenthood. Channel it productively — but don't overdo it physically. Your body still needs rest.
When should I go to the hospital during the third trimester?+
Contact your provider or go to the hospital if you experience regular contractions (every 5-10 minutes for an hour), your water breaks (a gush or steady leak of fluid), vaginal bleeding, severe headache with vision changes, sudden severe swelling, significantly decreased fetal movement, or fever. For Braxton Hicks contractions that are irregular and stop with rest, you can usually manage at home. When in doubt, call — your provider would rather hear from you unnecessarily than have you wait too long. You'll discuss specific guidelines with your provider at your next visit.
Product picks for week 28
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Hospital bag packed and ready
If you haven't started packing, now is the time — a pre-packed hospital bag with toiletries, snacks, and comfort items reduces last-minute stress.
Nursing bra or sleep bra
Your breasts are changing in preparation for breastfeeding — a supportive, comfortable nursing bra works for both now and postpartum.
Car seat installation guide
Proper car seat installation is critical — a video guide or scheduling a free inspection at your local fire department ensures it's done right.
A quick note: This content is for informational purposes only and is not a substitute for professional medical advice. Always talk to your healthcare provider about any questions or concerns. Learn how we create our content.
Content based on guidance from the American College of Obstetricians and Gynecologists (ACOG), the American Academy of Pediatrics (AAP), Mayo Clinic, and peer-reviewed medical literature. Learn more about how we create our content.