27 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 27 weeks pregnant, your baby is about the size of a cauliflower, about 36.6 cm (14.4 in) long. You're in the second trimester, in month 6, with 13 weeks to go until your due date. This week's milestone: last week of trimester two. Symptoms vary from person to person.
| Week 27 at a glance | |
|---|---|
| Trimester | Second |
| Month | 6 |
| Weeks to due date | 13 |
| Baby's size | About the size of a cauliflower |
| Length | About 36.6 cm (14.4 in) |
| Weight | About 875 g (1.9 lb) |
| This week | Last week of trimester two |
Sizes are typical averages. Before about 20 weeks, length is measured crown to rump; after that, head to heel.
Your baby at 27 weeks
Your baby is about the size of a cauliflower and weighs about 875 g (1.9 lb). ACOG notes that at 27 weeks more fat is being added to keep the baby warm.
Your body at 27 weeks pregnant
This is the last week of the second trimester. You may feel kicks strongly now, and possibly see your belly move.
Things to do this week
- Ask your provider whether they want you to do kick counts, and how.
- Get the whooping cough vaccine if you're in the US window (27 to 36 weeks).
- Start a hospital bag list.
When to call your doctor or midwife
Contact your care team straight away if:
- your baby's movements slow down or change once you've started feeling a pattern, or you haven't felt any movement by 24 weeks
- you have a severe headache, vision changes, pain just below your ribs, or sudden swelling of your face, hands or feet (possible signs of pre-eclampsia)
- you have regular contractions, pelvic pressure or a low, dull backache before 37 weeks
- you have bleeding or fluid leaking from your vagina
- 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 27 in Momi
Start getting to know your baby's movement pattern. Momi's kick counter saves each session so you can see what's normal for your baby. 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
← 26 weeks pregnant · All weeks · 28 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 27 weeks pregnant?
On average, a baby at 27 weeks is about the size of a cauliflower: about 36.6 cm (14.4 in), about 875 g (1.9 lb). These are typical averages, and healthy babies vary.
How many months is 27 weeks pregnant?
27 weeks pregnant is in the sixth month of pregnancy and the second trimester. Months don't divide evenly into 40 weeks, so different sources may label the month slightly differently.
What should I do at 27 weeks pregnant?
Ask your provider whether they want you to do kick counts, and how. Get the whooping cough vaccine if you're in the US window (27 to 36 weeks).
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.
