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30 Weeks Pregnant: Baby Size, Symptoms and What to Do

Week 30 is in the third trimester, month 7 of pregnancy. Here's how big your baby is, what's developing, what you may feel and what to do this week.

Week 30 · 3rd trimester · month 7
About the size of a coconut
about 15.7 in (40 cm) · 3.4 lb (1,520 g) (head to heel)

Your baby this week

Your baby's eyes can now focus. After birth, babies see best at about 8 to 10 inches, roughly the distance to your face during a feeding.

At 30 weeks your baby's brain is growing especially fast, and the bone marrow has fully taken over making red blood cells. Lanugo, the fine body hair, is starting to disappear. Many providers check growth now by measuring fundal height, and an extra ultrasound may be ordered if your measurements are off track. For you, fatigue and frequent peeing may return, and mood swings are common as birth gets closer. If you feel down, anxious or unable to enjoy things for more than two weeks, tell your provider: depression during pregnancy is common and treatable, and help is available.

By the numbers

Week 30 covers days 210 to 216 counted from the first day of your last period, which is 75% of a 40-week pregnancy. About 70 days remain until a 40-week due date. Since last week, an average baby gains about 6 oz (170 g). By date of conception, your baby is about 28 weeks old.

Pregnancy is dated from the first day of your last period, so conception happens around week 2. Your due date is 280 days (40 weeks) from that day, and an early ultrasound may adjust it.

Your body

Fatigue and frequent peeing may be back. Call labor and delivery right away for sudden or severe belly pain, bleeding or fluid leaking from your vagina.

Tests and to-dos this week

Tour your hospital or birth center, in person or virtually, and start a birth plan to talk over with your provider.

  • Tdap (whooping cough) vaccine · weeks 27–36 · vaccine

    Recommended during each pregnancy, preferably early in this window.

Coming up: RSV vaccine (September–January) (from week 32). Full prenatal visit schedule

Tips for the third trimester

  • From 28 weeks, go to sleep on your side; if you wake on your back, just roll over.
  • Pack your hospital bag and agree with your provider on when to head in.
  • Call right away, even at night, if your baby moves less or differently.
  • Know the signs of labor: regular, strengthening contractions, your water breaking or a bloody show.

Call your provider or labor and delivery right away if you have:

  • your baby is moving less or differently than usual
  • your water breaks, especially if the fluid is green, brown or smells bad
  • bright red bleeding or constant, severe belly pain
  • a severe headache, vision changes, pain under the ribs or sudden swelling
  • intense itching, especially on the palms and soles

In an emergency, call 911.

Last week and next week

Last week (29): Your baby is fully formed and now focused on growing and maturing.

Next week (31): Your baby is very active and filling out nicely.

Frequently asked questions

How big is the baby at 30 weeks?

About the size of a coconut: about 15.7 in (40 cm) · 3.4 lb (1,520 g), measured head to heel. These are rounded averages, and every baby grows at their own pace.

How many months is 30 weeks pregnant?

30 weeks is in month 7 and the third trimester. About 10 weeks (70 days) remain until a 40-week due date. Months are approximate; providers count weeks and days.

Is there an ultrasound at 30 weeks?

Not routinely in the US. Your provider tracks growth by measuring fundal height, and orders an ultrasound if the measurement is off or there's a medical reason.

What's the next test or appointment after week 30?

Next up: RSV vaccine (September–January), from week 32. Your provider may schedule things differently depending on your health and local practice.

Sources

Last reviewed: November 14, 2026 · Kitpebble editorial team

This page is for general information. It isn't medical advice or a diagnosis and doesn't replace your OB-GYN or midwife. Sizes are rounded averages. Our editorial policy

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