Pregnant

You're growing a brain and a body, and your own brain is changing too. Here's what supports both of you, without the pressure of doing everything perfectly.

Illustration of a pregnant woman looking down at her belly, with a glowing brain and a baby with a glowing brain inside

The three trimesters at a glance

A full-term pregnancy averages about 40 weeks. Choose a trimester to see what's happening for your baby, your body, and your mind.

Your baby, week by week

Sizes are averages. Healthy babies come in many different sizes.

How weeks are counted: providers count pregnancy from the first day of your last period, not from conception. Conception usually happens about two weeks later, so at "4 weeks pregnant," the embryo is about two weeks old. Trimester cutoffs also vary slightly between sources.

Inside the womb: how it fits together

Side view of a pregnant body A simple drawing with eight numbered parts: the uterus, the amniotic sac and fluid, the placenta, the umbilical cord, the cervix, the vagina, the bladder, and the baby lying head-down inside the uterus. 12345678
  1. Uterus (womb)The muscular organ where the baby grows. It stretches during pregnancy to hold the baby, the placenta, and the amniotic fluid.
  2. Amniotic sac and fluidA fluid-filled sac that cushions and protects the baby and lets the baby move.
  3. PlacentaA temporary organ attached to the wall of the uterus. It passes oxygen and nutrients from your blood to the baby, carries waste away, and makes hormones.
  4. Umbilical cordThe cord that connects the baby to the placenta. Its blood vessels carry oxygen and nutrients to the baby and waste back.
  5. CervixThe lower end of the uterus. It stays firm and closed during pregnancy, then softens and opens (dilates) for birth.
  6. Vagina (birth canal)The passage from the cervix to the outside of the body. It stretches during a vaginal birth.
  7. BladderSits in front of the uterus. As the uterus grows it presses on the bladder, which is why you may need to urinate more often.
  8. Baby (embryo, then fetus)Called an embryo until about week 10 of pregnancy and a fetus after that. Here the baby is head-down, the usual position near the end of pregnancy.
A simple side view of a pregnant body. Real bodies and pregnancies look different; this shows how the parts fit together, not how any one pregnancy looks.

When is a baby "full term"?

Medical groups updated these definitions in 2013, because babies born even a week or two early can face more health risks than babies born at 39 weeks or later.

Before 37 weeksPreterm
34–36 weeks: late preterm
37–38 weeksEarly term
39–40 weeksFull term
41 weeksLate term
42+ weeksPost term

Why 39 weeks matters

The last weeks give the baby's lungs, brain, and liver time to finish developing. Unless there's a medical reason to deliver sooner, the NIH advises waiting until at least 39 weeks.

If your baby comes early

Babies born before 37 weeks have a higher risk of problems like developmental delays, vision and hearing problems, and cerebral palsy, and they get specialized care to help. Medicine has come a long way: in an NIH research network study of babies born from 2003 to 2007 at its hospitals, 92% of those born at 28 weeks survived to go home, though many faced serious health challenges.

Care for NICU parents too

Having a baby in intensive care is a known risk factor for parents' depression and anxiety, and it can take a toll on any parent. Ask the NICU team about family support, and lean on the support lines.

Early birth is rarely anyone's fault. Most preterm births happen for reasons parents can't control. Your baby's early arrival says nothing about how much you love or protected them.

If your baby is breech

About 3 to 4 in 100 babies are still bottom- or feet-first near the end of pregnancy. Hearing this can be stressful, especially if you'd hoped for a certain kind of birth. Here are the usual options; your provider will help you decide.

Wait and watch

Many babies turn on their own before about 36 weeks. Your provider will check position at later visits.

Turning the baby

In an external cephalic version (ECV), usually offered around 37 weeks, a doctor gently presses on your belly to roll the baby head-down, with ultrasound and heart-rate monitoring before, during, and after. It works roughly half to two-thirds of the time, more often if you've given birth before. Serious problems are rare, and you can ask to pause or stop at any time.

Planning the birth

If the baby stays breech, most babies are born by planned cesarean. Some hospitals with experienced providers offer a planned vaginal breech birth for carefully selected pregnancies. Either way, a cesarean is not a failure.

Home and alternative methods

Positions like the breech tilt, playing music low on the belly, moxibustion, chiropractic techniques, or homeopathy are popular, but there's little strong evidence that they work. Talk with your provider before trying any, especially anything involving herbs, pressure, or lying upside down.

How a doula can help during a version

A doula can explain what to expect beforehand (it can be uncomfortable and lasts about 5 to 20 minutes, and a medicine to relax the uterus may make your heart race), help you breathe slowly and stay relaxed, remind you that you can ask for a pause, and stay afterward to talk it through, whatever the result.

Your feelings count

Disappointment, worry, or grief over a changed birth plan are normal. Talking about them with your partner, doula, or provider, before and after, can help you feel more in control.

Stress and your nervous system

Everyday stress is part of life and doesn't harm your baby. Research on stress in pregnancy focuses on distress that is high and long-lasting, especially when there's little support.

A 2024 review in Molecular Psychiatry brought together brain-imaging studies from pregnancy through adulthood. Ongoing anxiety, stress, or depression during pregnancy was linked with differences in how parts of the baby's brain involved in emotion and memory develop. These are associations, not certainties, and they come with good news: therapy such as cognitive behavioral therapy, interpersonal therapy, and mindfulness reduces distress in pregnancy, and treating a parent's distress has been shown to benefit children's mental health too.

About 1 in 8

recent mothers report symptoms of postpartum depression, according to the CDC. Counting all mood and anxiety conditions during pregnancy and after birth, estimates are closer to 1 in 5. Even among well-resourced, highly educated women, about a quarter screened high for anxiety and stress in one study.

Most

people with depression during pregnancy or after birth don't get treatment, in part because it often goes unrecognized. Estimates range from more than half to about 8 in 10. That's why routine screening and honest conversations at every visit matter.

Support protects

Social support, in personal, family, and community relationships, is one of the most consistent protective factors for mental health in pregnancy.

This research is a reason to get support, not a reason for guilt. Distress in pregnancy is common, it is no one's fault, and it responds to care. And the care your baby receives after birth can soften its effects. What helps after a stressful pregnancy Why we talk about this without shame
The goal isn't zero stress. It's having ways to come back down: a calm breath, a walk, a person you can call, enough sleep. Your body learns regulation, and your baby benefits from it.

Downshift daily

Try slow breathing with a longer exhale (for example, in for 4, out for 6) for a few minutes. Longer exhales are linked to calmer heart rhythms through the vagus nerve.

Protect sleep

Sleep often gets harder as pregnancy goes on. Naps, side sleeping with pillows, and a wind-down routine all count.

Move in ways that feel good

For most healthy pregnancies, guidelines encourage about 150 minutes of moderate activity a week. Check with your provider about what's right for you.

Ask to be screened

The American College of Obstetricians and Gynecologists recommends screening for depression and anxiety during pregnancy and after birth. You can ask for it at any visit.

Comfort and calm: what the evidence supports

Many families are drawn to natural approaches. Here's what research supports, and where to be careful.

Movement

For most healthy pregnancies, about 150 minutes a week of moderate activity is recommended, and early studies suggest it may support the baby's developing brain too. Walking, swimming, stationary cycling, modified prenatal yoga, and light strength training are good choices, and sitting less helps too. Moderate exercise doesn't harm the baby's heart rate or blood supply in healthy pregnancies. Skip hot yoga, contact sports, and activities with a risk of falling, and check with your provider first.

Nausea

Small, frequent meals help. Vitamin B6 is a common first step, and ginger may help some people. Ask your provider before starting any supplement, and call if you can't keep fluids down.

A doula

Continuous support during labor from a trained companion is one of the best-studied comfort measures. It's linked to more spontaneous births, less use of pain medication, shorter labors, and more positive birth experiences.

Calming practices

Mindfulness, breathing exercises, and prenatal yoga can ease stress and anxiety in pregnancy. Childbirth classes and relaxation techniques like hypnobirthing may help some people feel more confident in labor.

How hard is right? The talk test

Instead of watching your heart rate, use the talk test: during moderate activity you can talk comfortably but not sing. Drink water, and avoid getting overheated, especially in hot, humid weather. Regular movement can also ease back pain and constipation, lift mood, and improve sleep.

Stop and call your provider if you notice

Vaginal bleeding or fluid leaking, regular painful contractions, dizziness or feeling faint, chest pain, trouble breathing before you start, a headache, muscle weakness that affects your balance, or pain or swelling in your calf.

"Natural" doesn't always mean safe

Many herbs, such as valerian, lemon balm, and concentrated lavender supplements, haven't been studied enough in pregnancy to know they're safe. Raspberry leaf tea is popular, but evidence that it eases labor is weak. Ask your prenatal provider or pharmacist before trying any herb, tea in large amounts, or supplement.

Hands-on therapies

Acupuncture may help some people with nausea or back pain, and chiropractic care may ease low back pain. Choose practitioners trained in prenatal care, and let your obstetric provider know.

Things nobody tells you about your baby

See all ten

Before your baby arrives: two ideas about connection and about your own past that parents rarely hear.

Packing for the hospital or birth center

Aim to pack about a month before your due date. Check off as you go; your list stays in this browser. Hospitals usually provide a gown, basic toiletries, and disposable underwear for you, and diapers, wipes, and blankets for your baby. Labor can be messy, so leave your nicest clothes at home.

Don't forget your mind. If you've had depression, anxiety, or another mental health condition, share it with your care team when you arrive, along with any medicines you take. Knowing helps them support you after birth.

Your feed and your mind

Nearly everyone who is pregnant now turns to social media for information and support. A 2025 review of recent studies found it can genuinely help: groups moderated by midwives or other professionals improved knowledge, confidence, and help-seeking, and reduced isolation, especially for people with high-risk pregnancies. The same review found real risks: much pregnancy content online isn't backed by science, idealized images can lower self-esteem and raise worry, and heavy use has been linked with poorer sleep and mood.

A UK study that followed more than 1,100 pregnant people found social media use climbs from early pregnancy to about 20 weeks, then levels off. First-time parents used it more. Mid-pregnancy is a good moment to check in with your scrolling.

Choose moderated spaces

Groups run or checked by midwives, nurses, or health organizations tend to share more accurate information than unmoderated ones.

Notice how you feel after

If an account leaves you more anxious or less happy with your body, it's fine to mute or unfollow it.

Bring it to your visit

Saw something worrying? Write it down and ask your provider rather than acting on it alone.

Guard your health data

Pregnancy apps and social platforms often collect sensitive information. Check privacy settings and be thoughtful about what you share.

Expecting twins or more

A systematic review of 27 studies found that most research points to more depression, anxiety, and parenting stress for parents of multiples in the first months and years than for parents of one baby, and the strain tends to be greater with triplets than twins. Fathers and partners were affected too. The reasons make sense: one study found parents of newborn twins handled about 19 feedings in 24 hours, on top of more medical visits, money pressure, and broken sleep.

Plan help before birth

Line up people for nights, meals, and errands now. Accepting help was a theme in parents' own accounts of what got them through.

Both parents need care

Partners of parents of multiples often carry an especially heavy share of baby care, along with the same sleep loss. Screen both of you.

First-time parents of multiples

Learning to parent and caring for two or more babies at once is a lot. Extra stress is expected, not a sign you're failing.

Fairness guilt is normal

Parents of multiples often worry about giving each baby equal attention. Each baby's individuality will show over time.

You don't have to wait until it's bad

These free US lines are for parents, partners, and anyone supporting them, during pregnancy and after.

Outside the US, contact your local emergency number or health service. If someone has confusion, hallucinations, or thoughts of harming themselves or the baby, call 911 or go to an emergency room.

Physical warning signs like chest pain, trouble breathing, a severe headache, or heavy bleeding during pregnancy or in the year after birth also need care right away. See urgent warning signs

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