15 weeks pregnant
Your baby can start to hear you.
In short
At 15 weeks your baby is about the size of an apple, around 16.7 cm long and 114 g. Your baby can start to hear you.
- Second trimester, week 15 of about 40.
- Loose cotton clothes, mild unperfumed soap and a moisturiser can help ease itchy skin.
Around now your baby starts to hear muffled sounds. They can pick up your voice, your heartbeat and the gurgles of your digestion.
How big is my baby at 15 weeks?
At 15 weeks your baby is about the size of an apple, around 16.7 cm long and 114 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 15 weeks?
- Around now your baby starts to hear muffled sounds.
- They can pick up your voice, your heartbeat and the gurgles of your digestion.
- Even with the eyelids closed, your baby's eyes are becoming sensitive to light.
- Eyebrows and eyelashes are starting to grow.
What changes for me at 15 weeks pregnant?
- You might notice more vaginal discharge, which is normal if it's clear or white and doesn't smell strongly.
- The skin on your bump may feel itchy as it stretches.
- Occasional sharp twinges on the sides of your bump are common.
What is a good tip for this week?
Loose cotton clothes, mild unperfumed soap and a moisturiser can help ease itchy skin.
What can a partner do this week?
Talk, read or sing to the bump, as your baby is beginning to hear voices.
What should I know in Ireland at 15 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: If itching becomes severe or you notice a rash, contact your midwife, GP or maternity unit. 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.