Pregnancy often feels like a mystery. You know your baby is growing, but what are they actually doing inside the womb each day? As a midwife, I love sharing some of the incredible - and often surprising - facts about fetal development. It helps parents feel more connected to their baby long before birth.
Here are 10 fascinating things you may not know about what your baby is doing in the womb.
1. Babies Hiccup in the Womb
Many parents first notice little repetitive “jumps” late in pregnancy - these are fetal hiccups. They are caused by rhythmic contractions of the diaphragm, and they help strengthen the breathing muscles your baby will need after birth. Frequent hiccups are usually a reassuring sign of healthy neurological development.
2. They Practise Breathing Movements
Even though babies do not breathe air in the womb, they practise breathing movements by moving amniotic fluid in and out of their lungs. This begins from around 9–10 weeks and becomes more coordinated as pregnancy progresses, preparing them for their very first breath.
3. Babies Can Taste Flavours
From about 20 weeks, taste buds are well developed, and the flavours of your meals pass into the amniotic fluid. Studies show that babies swallow more when the fluid is sweet, and less when it is bitter. This early exposure may even influence taste preferences after birth.
4. They Can Hear Your Voice
By the third trimester, your baby can hear sounds outside the womb, particularly lower tones like your voice. Research suggests babies recognise and are calmed by their mother’s voice after birth, showing how powerful this early connection can be.
5. Sleep Cycles Begin Before Birth
Babies in the womb experience active (REM-like) and quiet sleep cycles. Ultrasound shows them having periods of movement and stillness, just like newborns. This means your baby is already developing early patterns of rest and activity.
6. They Practise Sucking and Swallowing
From around 14 weeks, babies start swallowing amniotic fluid, and later, they practise sucking movements. This strengthens the muscles they need for feeding. Sometimes, ultrasounds even capture babies sucking their thumbs before birth.
7. Babies Respond to Light
Although the womb is dark, babies can sense light from about 25 weeks. If a strong light is shone on the abdomen, they may turn their head or move in response. This shows that their optic nerves and brain pathways are developing.
8. They Develop Hair and Vernix
Babies grow fine body hair called lanugo, which helps anchor vernix (the creamy white coating) to their skin. Vernix protects the skin from amniotic fluid and has antibacterial properties. Most of the lanugo sheds before birth, though some babies are born with it still visible.
9. Babies Get the Hiccups and Sneezes - But No Tears
While hiccups are common, babies cannot produce emotional tears in the womb because their tear ducts are not yet fully functioning. Sneezing movements may occur to help clear fluid from the nose, though these are not the same as post-birth sneezes.
10. They Learn to Recognise Touch and Bond
By the second trimester, babies respond to touch - both their own (touching their face or body) and from outside the womb. Stroking your belly can sometimes stimulate gentle movements in response, an early form of connection and bonding.
The Takeaway
Your baby is not just passively growing in the womb. They are practising breathing, swallowing, sleeping, hearing, tasting, and moving - all the skills they will need after birth. Understanding these hidden milestones can help you feel even more connected to your little one before you meet them.
Disclaimer: This article is for general educational purposes only. Always seek advice from your GP, midwife, or obstetrician if you have concerns about your pregnancy or your baby’s development.
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