30 Weeks Pregnant
Reviewed by Safi Allah Khan
Medically reviewed by: Safi Allah Khan · Written by the Momi team · Last updated 20 October 2026
Quick answer: At 30 weeks pregnant, your baby is about the size of a cabbage, about 39.9 cm (15.7 in) long. You're in the third trimester, in month 7, with 10 weeks to go until your due date. This week's milestone: bone marrow makes blood cells. Symptoms vary from person to person.
| Week 30 at a glance | |
|---|---|
| Trimester | Third |
| Month | 7 |
| Weeks to due date | 10 |
| Baby's size | About the size of a cabbage |
| Length | About 39.9 cm (15.7 in) |
| Weight | About 1.3 kg (2.9 lb) |
| This week | Bone marrow makes blood cells |
Sizes are typical averages. Before about 20 weeks, length is measured crown to rump; after that, head to heel.
Your baby at 30 weeks
Your baby is about the size of a cabbage and weighs about 1.3 kg (2.9 lb). The bone marrow is now making red blood cells.
Your body at 30 weeks pregnant
Mood swings, trouble sleeping and back pain are common. Shortness of breath can increase as your uterus presses up.
Things to do this week
- Practise relaxation or breathing techniques.
- Install the car seat or plan to borrow one.
- Pack some hospital bag items.
When to call your doctor or midwife
Contact your care team straight away if:
- your baby is moving less than usual, has stopped moving, or the pattern has changed. The NHS says to call immediately, even in the middle of the night
- you have a severe headache, vision changes, pain below your ribs or sudden swelling (possible pre-eclampsia)
- you have intense itching, especially on the palms of your hands or soles of your feet
- you have contractions, your waters break or you bleed before 37 weeks
- you have a fever of 100.4°F (38°C) or higher
If something feels wrong, trust that feeling and call. In an emergency, call your local emergency number.
Track week 30 in Momi
Keep a weekly bump photo in Momi. The changes are fast in the third trimester. Momi follows your pregnancy week by week with your baby's size and development, and keeps your diary, bump photos, appointments, kick counts and contractions in one place.
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Keep reading
← 29 weeks pregnant · All weeks · 31 weeks pregnant →
Sources
- ACOG: Changes During Pregnancy (infographic)
- NHS: Your baby's movements
- NHS: Antenatal care and appointments
- CDC: Urgent Maternal Warning Signs
Medical disclaimer: Momi and this website provide general information, not medical advice. Always talk to your doctor or midwife; in an emergency call your local emergency number.
FAQ
How big is a baby at 30 weeks pregnant?
On average, a baby at 30 weeks is about the size of a cabbage: about 39.9 cm (15.7 in), about 1.3 kg (2.9 lb). These are typical averages, and healthy babies vary.
How many months is 30 weeks pregnant?
30 weeks pregnant is in the seventh month of pregnancy and the third trimester. Months don't divide evenly into 40 weeks, so different sources may label the month slightly differently.
What should I do at 30 weeks pregnant?
Practise relaxation or breathing techniques. Install the car seat or plan to borrow one.
Related guides
Track this in Momi
Momi is a free pregnancy tracker app for iPhone and Android that follows pregnancy week by week, estimates the due date, and keeps a pregnancy journal, weight log, kick counter and contraction timer in one place.
