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Pregnancy week by week

25 weeks pregnant

Your baby may jump at loud noises.

In short

At 25 weeks your baby is about the size of a courgette, around 33.7 cm long and 778 g. Your baby may jump at loud noises.

  • Second trimester, week 25 of about 40.
  • Most antenatal classes start between 26 and 32 weeks. If you haven't booked yet, contact your maternity unit now.
About the size ofCourgette
Length, head to heel33.7 cm
Typical weight778 g

Your baby responds to touch, sound and your voice by moving. A sudden loud noise can make them jump and kick, which is called the startle response.

How big is my baby at 25 weeks?

At 25 weeks your baby is about the size of a courgette, around 33.7 cm long and 778 g. 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 25 weeks?

What changes for me at 25 weeks pregnant?

What is a good tip for this week?

Smaller meals, sitting upright while you eat and cutting back on caffeine can ease heartburn.

What can a partner do this week?

Talk and sing to the bump and see if your baby answers with a wriggle.

What should I know in Ireland at 25 weeks?

When to get help: Get help straight away from your midwife, GP or maternity unit if swelling appears suddenly or gets worse quickly or if one calf or leg is swollen and painful. 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.