35 Weeks Pregnant
At 35 weeks pregnant your baby is about 18 inches long and around 5 to 5 1/2 pounds, with the brain and lungs still doing serious finishing work. The brain weighs only about two-thirds of its full-term size, which is one reason providers recommend against scheduling delivery before 39 weeks. Practice contractions and broken sleep tend to pick up around now.
Your week at a glance
| This week | Details |
|---|---|
| Baby size | About a honeydew melon, roughly 18 inches and 5 to 5 1/2 pounds (46 cm, 2.38 kg) |
| What is developing | Brain and lungs maturing fast, fat for warmth, smoother skin, fully developed kidneys |
| Your symptoms | Stronger Braxton Hicks, interrupted sleep, heartburn, frequent peeing, pelvic pressure |
| To-do | Count kicks daily, finish the hospital bag, install the car seat, expect GBS screening soon |
How big is your baby at 35 weeks?
Your baby is roughly the size of a honeydew melon this week, about 18 inches long and weighing somewhere around 5 to 5 1/2 pounds. The most important work happening right now is invisible from the outside but really significant: the brain and lungs are still putting on the finishing touches. At 35 weeks, your baby's brain weighs only about two-thirds of what it will weigh at full term, and a remarkable amount of brain growth, folding, and connection is still ahead in the next few weeks. The lungs are practicing breathing motions, and surfactant — the substance that keeps the tiny air sacs from collapsing — is still being made in larger amounts.
This is one of the reasons ACOG strongly recommends against scheduling deliveries before 39 weeks unless there is a clear medical reason. Babies born even a couple of weeks earlier than that can have more trouble with breathing, feeding, body temperature, and jaundice, simply because they have not finished maturing. If your provider is talking with you about an earlier delivery for a specific medical reason, that is different — they are weighing what is safer for you and your baby. Outside the brain and lungs, your baby is also packing on fat for warmth after birth, the skin is becoming smoother and less translucent, and the kidneys are fully developed.
Space is tight. By 35 weeks, your baby fills nearly all the available room in your uterus, and movements may feel more like firm pushes, rolls, and stretches than the sharp jabs you remember from earlier. Hiccups, which feel like rhythmic little thumps, are common and a good sign. You should still feel your baby move regularly every day. Pick a quiet time, lie on your side, and count how long it takes to feel 10 movements. Most parents feel 10 well within an hour. The most important thing to watch for is a clear change from the pattern you know — if movement feels noticeably less or different, call your provider's office or labor and delivery line so they can check in.
35 weeks pregnant symptoms
Your fundal height is about 35 centimeters now, and your uterus reaches just below your breastbone. These are the common, normal things you may notice this week:
- Stronger, more frequent Braxton Hicks contractions — the belly tightens into a hard ball, then completely relaxes; true practice contractions don't get longer, stronger, or closer together
- Interrupted sleep from bathroom trips, heartburn, vivid dreams, leg cramps, and the work of turning a 35-week belly over in bed
- Heartburn that often peaks now as the uterus presses on your stomach
- Pelvic pressure and frequent urination
- Mood swings between excited and overwhelmed, and real anxiety about labor for many people
Side sleeping (either side, but many providers prefer left) is the most comfortable and kindest position for circulation. A pillow between your knees, one supporting your belly, and one behind your back can act like a soft nest. This is also a good week to talk together about the baby blues versus postpartum depression — the baby blues are common, mild, and short-lived in the first two weeks after birth, while postpartum depression and anxiety last longer, feel heavier, and deserve real support. Mental health screening is a standard, judgment-free part of US prenatal and postpartum care.
Taking care of yourself this week
Rest is non-negotiable right now. You are doing the equivalent of running a marathon every single day, and your body needs more downtime than usual. Aim to lie down on your left side for a bit at midday if you can — even 20 minutes can ease swelling and help with blood flow to your baby. Gentle movement still matters too: short walks, prenatal yoga, swimming, and time on a birth ball with slow hip circles all help with circulation, sleep, and keeping your hips loose for labor. Stop if anything feels sharp, dizzy, or off.
- Iron-rich foods like lean meat, poultry, beans, lentils, and dark leafy greens — paired with vitamin C foods like citrus, peppers, and strawberries — support blood volume and ease that bone-deep fatigue.
- Plenty of water through the day reduces practice contractions and helps with swelling.
- Several small meals work better than three big ones this late, because your stomach has very little room.
- Finish the hospital bag — insurance card and photo ID, a copy of your birth preferences, phone charger with a long cord, comfortable slippers and robe, stretchy underwear, snacks for your support person, and a going-home outfit for you and the baby.
The car seat itself should be installed in the back seat by 36 weeks — most fire stations or hospitals can check the installation for free. Continue standard pregnancy food safety: wash produce thoroughly, fully cook meat, poultry, and eggs, skip unpasteurized soft cheeses and milk, heat deli meats until steaming, and stay away from high-mercury fish like swordfish, shark, king mackerel, and tilefish. Tuck one or two small comfort items just for you into the bag — labor is hard work, and tiny familiar things help more than you'd expect.
Appointments & tests
Sometime between 36 and 37 weeks — sometimes as early as 35 — your provider will offer a Group B strep (GBS) screening. GBS is a common bacteria that lives harmlessly in the vagina or rectum of about one in four pregnant people. It is not a sexually transmitted infection and does not mean anything is wrong. The test is a quick swab — your provider gently swabs the lower vagina and rectum (you can also do it yourself if you prefer), and the swab goes to the lab. Results come back in a few days. If GBS is positive, your care team will simply plan to give you IV antibiotics during labor to protect your baby from a rare but serious newborn infection. Knowing your status ahead of time means a smooth, safe plan.
At this visit, your provider will likely also check your blood pressure, dip your urine for protein and sugar, weigh you, measure fundal height, listen to your baby's heartbeat, and feel your belly to check your baby's position. If your baby is not yet head-down, your provider may talk to you about an external cephalic version (ECV) — a procedure usually offered around 36 to 37 weeks where they try to gently turn the baby from the outside. A few things to take care of around this visit: pre-register at the hospital or birth center where you plan to deliver (most ask for paperwork by 36 weeks), confirm your insurance covers the planned delivery location, and ask about adding your baby to your plan after birth.
Call your provider if
- A clear decrease in your baby's movement compared to their usual pattern
- Any bright red vaginal bleeding heavier than a smear on toilet paper
- A sudden gush or persistent trickle of fluid from your vagina (your water may have broken)
- Regular contractions every five minutes for an hour before 37 weeks (possible preterm labor)
- Severe or persistent headache, vision changes, sudden swelling in your face or hands, or upper-right belly pain (possible preeclampsia)
- Heavy bleeding soaking a pad in an hour, fainting, or no movement at all after lying on your left side for an hour — go to the ER or call 911
Reflects Mayo Clinic and Cleveland Clinic third-trimester fetal-development references and fetal-movement (kick count) guidance, 2024–2026.
Related questions
- How big is the baby at 35 weeks pregnant?
- Roughly the size of a honeydew melon — about 18 inches long and around 5 to 5 1/2 pounds (about 46 cm and 2.38 kg). The brain and lungs are still maturing, the skin is getting smoother, and the kidneys are fully developed.
- What is the Group B strep (GBS) test at 35 weeks?
- GBS is a common bacteria that lives harmlessly in the vagina or rectum of about one in four pregnant people. Sometime between 36 and 37 weeks — sometimes as early as 35 — your provider does a quick swab of the lower vagina and rectum. If it's positive, your team plans to give you IV antibiotics during labor to protect your baby. It is not a sexually transmitted infection and does not mean anything is wrong.
- Why is the brain still developing at 35 weeks?
- At 35 weeks your baby's brain weighs only about two-thirds of what it will weigh at full term, and a lot of brain growth, folding, and connection is still ahead. This is one reason ACOG recommends against scheduling deliveries before 39 weeks unless there is a clear medical reason.
- Are strong Braxton Hicks contractions normal at 35 weeks?
- Yes. Practice contractions often feel more intense and more frequent this week — your belly tightens into a hard ball for 30 seconds to a couple of minutes, then completely relaxes. They do not get longer, stronger, or closer together, and they ease when you change position, drink water, and lie on your left side. If contractions come every five minutes for an hour or come with leaking fluid, call your provider.
Sources & further reading
ParentFlow: one free app, pregnancy to age six
ParentFlow follows your pregnancy week by week — baby size, what's developing, your symptoms, and the appointments and warning signs that matter — then becomes a free baby tracker for feeds, sleep, and growth after birth. Free on iPhone and Android.
App Store Google Play Open Web AppThis article reflects current ACOG, Mayo Clinic, Cleveland Clinic, CDC, and FDA guidance and is for educational purposes only. It does not constitute medical advice. ParentFlow is a wellness companion — not a substitute for your obstetric provider. For any medical concern, contact your healthcare provider.