33 Weeks Pregnant
At 33 weeks pregnant your baby is about the size of a pineapple — roughly 17.5 inches long and around 4.25 pounds — and amniotic fluid is at its peak, so kicks and rolls feel especially strong. Your baby is adding about half a pound a week in body fat from here to delivery, smoothing out the wrinkled look from earlier weeks and helping them hold a steady temperature after birth.
Your week at a glance
| This week | Details |
|---|---|
| Baby size | About a pineapple, roughly 17.5 inches and ~4.25 lb (43.7 cm, ~1.92 kg) |
| What is developing | About half a pound of fat a week, peak amniotic fluid, antibodies crossing, fast brain growth |
| Your symptoms | Rib pain, shortness of breath, pelvic pressure, leg swelling, carpal tunnel symptoms |
| To-do | Count kicks, finalize the birth plan, line up postpartum help, elevate your feet |
How big is your baby at 33 weeks?
Your baby is now about 17.5 inches long and roughly 4.25 pounds, around the size of a pineapple. They are adding about half a pound a week in body fat from here to delivery, smoothing out the wrinkled look from earlier weeks and helping them regulate temperature after birth. Amniotic fluid levels reach their peak around now, which is part of why movements often feel especially clear and forceful — your baby has a roomy cushion to push against. Over the next few weeks the fluid level will gradually decrease as your baby grows and takes up more space, and movements will start to feel less like big swooping rolls and more like focused jabs from elbows, heels, and knees.
The immune system is doing important last-stretch work. Antibodies (specifically IgG) are crossing to your baby through the placenta and building their first line of defense against illnesses your body has already met. This passive immunity will protect your newborn during their earliest months, before they are old enough to mount their own strong response or receive their full vaccine schedule. The lungs are still busy producing surfactant; the brain is in a stretch of rapid growth, forming the deep grooves and folds that mark a mature brain. Your baby has clear sleep and wake cycles, including REM sleep, and may have a noticeable pattern of busy and quiet times.
Most babies are head-down by now, although a small percentage are still breech and may flip in the next few weeks. Your provider will start checking position more carefully at upcoming visits.
33 weeks pregnant symptoms
As your baby gets bigger, most of what you feel this week comes from how little room is left. The common, normal symptoms now:
- Rib pain and shortness of breath, especially when your baby is in a position that pushes up under your ribs
- Pelvic pressure and lower back pain, often a daily companion at this stage
- Leg swelling by day's end, sometimes spreading to your hands and face by morning
- Carpal tunnel symptoms — numbness, tingling, or aching in your wrists and fingers from extra fluid pressing on the nerves
- Stronger, more frequent Braxton Hicks, persistent heartburn, hemorrhoids, and varicose veins
- Leg cramps, restless legs, broken sleep, vivid dreams, and frequent bathroom trips
- Mild dizziness when standing up too fast, more colostrum leaking, and a belly that feels rock-hard when the uterus tightens
Carpal tunnel is unpleasant but almost always resolves on its own in the weeks after birth. Mild, gradual swelling is normal; sudden or severe swelling — especially of the face or hands — deserves a same-day call, as can a persistent headache, blurry vision, or seeing spots (possible early signs of preeclampsia). Emotionally, the physical discomforts of late pregnancy can really wear on you, and frustration and impatience are very normal. Be gentle with yourself.
Taking care of yourself this week
A few simple habits take real weight off late-pregnancy aches. Elevate your feet whenever you sit — even a stool, a stack of books, or an ottoman helps fluid drain back. Avoid high-impact or jerky activities, and check with your provider before starting any new routine; walking, swimming, prenatal yoga, and a stationary bike are all still great choices. For carpal tunnel symptoms, gentle wrist stretches, avoiding sleeping with your wrists curled under, and wearing a soft wrist brace at night can help. Sleep on your side with one pillow between your knees and another supporting your belly to take strain off your hips and lower back.
- Protein — about 70 to 100 grams a day supports your baby's continued growth and helps your body prepare for milk production and recovery.
- Fiber from whole grains, beans, fruit, and vegetables, plus steady hydration (about 80 to 100 ounces a day), helps with constipation, hemorrhoids, and Braxton Hicks.
- Smaller, more frequent meals work better than large ones for heartburn.
- Keep food safety steady — cook poultry to 165°F, ground meats to 160°F, and whole cuts to 145°F, choose pasteurized dairy, wash produce well, and avoid high-mercury fish.
This is a key week for finalizing the bigger preparations. Write or polish your birth plan and bring a draft to your next visit for your provider's input — keep it short, focused on your values (who you want with you, comfort measures, pain management preferences, immediate newborn care), and hold it loosely since labor is unpredictable. Confirm your postpartum support: who will help with meals, laundry, older kids, and rest in the first two weeks? Even one or two specific people on speed dial makes a real difference. Confirm your pediatrician choice, finalize parental leave paperwork, and check that your insurance is ready to add your baby.
Appointments & tests
Your routine third-trimester visits continue every two weeks. A standard 33-week visit includes a blood pressure check, a urine dip looking for protein (an early sign of preeclampsia) and sugar, a weight check, a fundal-height measurement, and listening to your baby's heartbeat with a Doppler. Your provider will ask about your baby's movement patterns, any swelling (especially sudden or severe swelling), headaches, vision changes, sleep, mood, and contractions. They may also begin to check your baby's position more carefully by feeling your belly, though many providers do this casually at every visit.
From around now until delivery, your team will be watching especially closely for gestational hypertension (high blood pressure that develops during pregnancy), preeclampsia (high blood pressure plus protein in the urine and sometimes other signs), and fetal growth restriction (a baby measuring smaller than expected). If your fundal height is measuring behind or ahead of where it should be, your provider may order a growth ultrasound for a closer look. None of these are reasons to panic on their own — your team is checking proactively so anything that needs attention gets it early. The group B strep (GBS) swab is still ahead at 36 to 37 weeks, and if you have not received Tdap yet, the window is still open until 36 weeks. Good questions to bring: how is my blood pressure trending, is my baby head-down yet, when should we go over my birth plan in detail, and what are clear signs of true labor versus Braxton Hicks.
Call your provider if
- A severe or persistent headache that does not ease with rest, water, and acetaminophen, or blurry vision, spots, or flashes
- Sudden or severe swelling of the face or hands, sudden pain under your right ribs, or rapid weight gain of more than 3 to 5 pounds in a week (possible preeclampsia)
- A clear and lasting drop in your baby's movement compared with their usual pattern
- Any vaginal bleeding, a gush or steady trickle of fluid that could be amniotic fluid, or regular painful contractions before 37 weeks (especially four or more in an hour)
- A fever above 100.4°F, burning with urination, or sudden swelling, redness, warmth, or pain in one leg
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 33 weeks pregnant?
- About the size of a pineapple — roughly 17.5 inches long and around 4.25 pounds. Your baby is adding about half a pound a week in body fat from here to delivery, smoothing out the wrinkled look from earlier weeks.
- Why do kicks feel so strong at 33 weeks?
- Amniotic fluid levels reach their peak around now, so your baby has a roomy cushion to push against and movements often feel especially clear and forceful. Over the next few weeks the fluid level gradually decreases as your baby grows, and movements start to feel less like big swooping rolls and more like focused jabs.
- Is carpal tunnel normal at 33 weeks pregnant?
- Yes. Numbness, tingling, or aching in your wrists and fingers is caused by extra fluid pressing on the nerves in your wrists. It is unpleasant but almost always resolves on its own in the weeks after birth. Gentle wrist stretches, not sleeping with your wrists curled under, and a soft wrist brace at night can help.
- Is my baby head-down at 33 weeks?
- Most babies are head-down by now, although a small percentage are still breech and may flip in the next few weeks. Your provider will start checking position more carefully at upcoming visits. If yours is not head-down yet, there is usually still time to wait and see.
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.