37 Weeks Pregnant
At 37 weeks pregnant your pregnancy reaches early term, and your baby is around 6 1/2 pounds and about 19 inches long. Early term means 37 weeks 0 days through 38 weeks 6 days — babies born now usually do very well, but the brain and lungs are still finishing, so delivery is generally not scheduled before 39 weeks without a medical reason. Your body may be picking up pelvic pressure, more discharge, and possibly your mucus plug.
Your week at a glance
| This week | Details |
|---|---|
| Baby size | About a stalk of Swiss chard, roughly 19 to 19 1/2 inches and 6 1/2 pounds (49 cm, 2.86 kg) |
| What is developing | Early term reached; lungs finishing surfactant, brain still growing fast, strong grip, sharp reflexes |
| Your symptoms | Lightening and pelvic pressure, more discharge, possible mucus plug, backaches, broken sleep |
| To-do | Count kicks daily, learn the signs of labor and when to call, double-check the car seat install |
How big is your baby at 37 weeks?
Your pregnancy officially reaches early term this week. ACOG defines early term as 37 weeks 0 days through 38 weeks 6 days. Babies born during this window are healthy and usually do very well, but they are still doing important last-stretch work, so providers generally do not schedule deliveries before 39 weeks unless there is a medical reason. Your baby is around 6 1/2 pounds now and about 19 to 19 1/2 inches long, roughly the size of a stalk of Swiss chard. They are practicing breathing motions, sucking and swallowing, and even blinking. The brain weighs only about two-thirds of what it will weigh at 39 to 40 weeks, with rapid growth still happening.
Underneath the smooth, fat-cushioned skin, the lungs are wrapping up surfactant production, the digestive system is ready to handle milk, and your baby's reflexes are sharp. Their grip is so strong that newborns can briefly hold onto an adult's finger. Many of the small downy hairs called lanugo have shed, and the waxy vernix is thinner and more concentrated in skin folds. Your baby may swallow some of the lanugo and amniotic fluid, which will pass as that first dark, sticky bowel movement called meconium in the days after birth. Hearing is sharp — your voice, your partner's, and familiar songs are already being learned.
Most babies are head-down (vertex) by 37 weeks. If your baby is still breech, your provider may have already talked with you about an external cephalic version (ECV), which is most commonly offered around now. Movement may feel more like big rolls, stretches, and squirms than the sharp kicks of earlier weeks because space is tight. You should still feel your baby move regularly every day. Track your baby's normal pattern and notice clear changes. If you feel a clear decrease, lie down on your left side, drink something cold, and count movements for an hour. If you do not feel 10 distinct movements in that hour, or if anything still feels off, call your provider's office or labor and delivery line right away.
37 weeks pregnant symptoms
If you have not yet felt your baby drop, this can be the week it happens. Lightening — when your baby settles lower into your pelvis — can make breathing easier but adds pressure on your bladder, hips, and pubic bone. Your fundal height is around 37 centimeters and your bump may sit visibly lower. These are the common, normal things you may notice this week:
- A heavy, full sensation between your legs, a slight waddle to your walk, and many more trips to the bathroom
- More vaginal discharge as your cervix begins to soften and thin; some may be the mucus plug — a jelly-like glob, sometimes tinged with pink or brown blood
- Stronger Braxton Hicks contractions — real labor contractions, by contrast, get longer, stronger, and more regular and don't let up when you change position
- Backaches as your baby's head presses on your lower back, plus pelvic-girdle pain, leg cramps, and heartburn
- A little colostrum leaking from your breasts and broken sleep
Losing the mucus plug can happen days or weeks before labor and on its own is not an emergency, but always feel free to call. The emotional weather can swing a lot from day to day — calm and excited one afternoon, impatient or anxious the next. All of this is normal. If you find yourself feeling persistently low, panicky, or unable to enjoy things you used to love, mention it at your visit — your provider screens for mental health for a reason, and support is available without judgment.
Taking care of yourself this week
Keep movement steady but gentle this week. Walking remains one of the best things you can do — it eases pelvic pressure, supports digestion, helps with sleep, and may encourage your baby to settle deeper into the pelvis. Time on a birth ball with slow hip circles, side-lying stretches, cat-cow on hands and knees, and pelvic tilts also help with comfort. Stop right away if anything feels sharp, dizzy, or short of breath, and skip new or high-impact activities. If you started perineal massage a couple of weeks ago, keep going — research suggests it may modestly reduce the chance of tearing for first vaginal births.
- Smaller, more frequent meals work better than three big ones because your stomach has very little room — steady protein, complex carbs, healthy fats, vegetables, and fruit.
- Plenty of water keeps you hydrated and reduces practice contractions.
- Iron-rich foods like lean meats, beans, lentils, and dark leafy greens, paired with vitamin C foods like citrus or peppers, support your higher blood volume.
- Skip herbal labor-induction remedies unless your provider says yes.
One small step this week: double-check that your infant car seat is installed correctly. The seat should be rear-facing in the back seat (the middle is often safest if it fits), tightly anchored — it should not move more than an inch side-to-side at the base — and reclined at the angle marked. Most fire stations and many hospitals offer free car seat checks. Set up the basics at home too: a safe sleep space in your bedroom (firm flat surface, fitted sheet only, nothing soft in the sleep area), diapers and wipes, postpartum supplies (large pads, peri bottle, comfortable underwear), and your pediatrician's number on the fridge. Standard food safety still matters: wash produce, fully cook meat and eggs, heat deli meats until steaming, and avoid raw sprouts, unpasteurized dairy, and high-mercury fish.
Appointments & tests
Weekly visits continue now. A standard early-term visit includes checking your blood pressure, dipping your urine for protein and sugar, weighing you, measuring fundal height, listening to your baby's heartbeat, and checking your baby's position by feel. If your baby is breech, your provider will talk through options including ECV or, if needed, planning for a cesarean. Some providers offer cervical exams starting this week — an internal check to see whether your cervix is softening, thinning (effacement), or opening (dilation). A cervix that is one or two centimeters dilated does not mean labor is imminent, and a closed cervix does not mean labor is far away. Cervical exams are optional; you can ask to skip them.
This is a great week to have a clear conversation about the signs of labor and when to head in. Most providers ask you to call when your contractions are five minutes apart, lasting about a minute each, for at least an hour (often called the 5-1-1 rule), or sooner if it is not your first baby. Call right away — not in the morning — for any leaking fluid (which may mean your water has broken), any bleeding heavier than spotting, or a clear decrease in your baby's movements. Mucus plug loss alone is usually not a reason to head to the hospital but can be a sign labor is coming soon. A few other things to ask about: their approach to membrane sweeping (sometimes offered at 39 to 41 weeks), and what your hospital's induction policy is if you go past your due date.
Call your provider if
- A clear decrease in your baby's movement compared to their normal pattern
- Any bright red vaginal bleeding heavier than a smear on toilet paper
- A sudden gush or steady trickle of fluid from your vagina (your water may have broken)
- Regular contractions every five minutes for an hour, getting stronger and longer (this could be 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
- Is 37 weeks full term?
- Not quite — 37 weeks is early term. ACOG defines early term as 37 weeks 0 days through 38 weeks 6 days; full term begins at 39 weeks. Babies born at 37 weeks usually do very well, but they are still doing important brain and lung work, so providers generally do not schedule deliveries before 39 weeks unless there is a medical reason.
- How big is the baby at 37 weeks pregnant?
- Around 6 1/2 pounds and about 19 to 19 1/2 inches long, roughly the size of a stalk of Swiss chard (about 49 cm and 2.86 kg). The lungs are wrapping up surfactant production, the digestive system is ready for milk, and the grip is strong.
- What does losing the mucus plug at 37 weeks mean?
- As your cervix begins to soften and thin, you may pass the mucus plug — a thicker, jelly-like glob, sometimes tinged with pink or brown blood. It can happen days or weeks before labor and on its own is not an emergency. But always feel free to call your provider if you're unsure about what you're seeing.
- When should I call my provider about contractions at 37 weeks?
- Most providers ask you to call when your contractions are five minutes apart, lasting about a minute each, for at least an hour (the 5-1-1 rule), or sooner if it is not your first baby. Call right away — not in the morning — for any leaking fluid, any bleeding heavier than spotting, or a clear decrease in your baby's movements.
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.