27 weeks pregnant
Last week of the second trimester.
In short
At 27 weeks your baby is about the size of a loaf of bread, around 36.6 cm long and 1.04 kg. Last week of the second trimester.
- Second trimester, week 27 of about 40.
- If you're planning to fly, check your airline's rules. With one baby and a straightforward pregnancy, flying is considered safe up to 37 weeks.
More fat is building up under your baby's skin, making it smoother and less wrinkled. Your midwife or doctor can hear your baby's heartbeat with a special stethoscope.
How big is my baby at 27 weeks?
At 27 weeks your baby is about the size of a loaf of bread, around 36.6 cm long and 1.04 kg. Before about 14 weeks babies are measured from crown to rump; after that the figure is head to heel. These are typical figures from fetal growth charts. Your own baby may be bigger or smaller, and your scans are what count.
What is my baby doing at 27 weeks?
- More fat is building up under your baby's skin, making it smoother and less wrinkled.
- Your midwife or doctor can hear your baby's heartbeat with a special stethoscope.
- Your baby is putting on weight steadily.
- The brain, lungs and gut keep maturing.
What changes for me at 27 weeks pregnant?
- This is the last week of your second trimester.
- Bloating and constipation are common as your growing baby squeezes your stomach and hormones slow things down.
- Your back may ache with the extra weight you're carrying.
What is a good tip for this week?
If you're planning to fly, check your airline's rules. With one baby and a straightforward pregnancy, flying is considered safe up to 37 weeks.
What can a partner do this week?
Plan something relaxing together before the busier third trimester.
What should I know in Ireland at 27 weeks?
Nothing Ireland-specific falls in this week. Your care continues under the Maternity and Infant Care Scheme with your GP and maternity unit. See the full Irish pregnancy timeline for what is coming up.
When to get help: Get to know your baby's usual pattern and if movements slow down, change or stop, contact your maternity unit straight away. HSE: when to get help.
Want these updates on your phone? The Lullagram app has a free pregnancy section with this week-by-week guide, Irish dates worked out from your due date, a contraction timer and more. When your baby arrives, the baby tracker is ready in the same app.
Sources and guidance
This page is written to be consistent with the official guidance below. It is general information for parents in Ireland, not medical advice. Links checked 23 September 2026.