Share

When does an unborn baby start to breathe?

accreditation
0:00
play article
Subscribers can listen to this article

While in the womb, a baby is constantly getting oxygen and nutrients, yet he does not breathe in the same way as we do until the moment of birth.

At 12 weeks of pregnancy the left and right lobes of the lungs are starting to grow and branch out with small contractions, not breathing air, but stimulating the chest muscles to develop.

Breathing movements can be seen as early as 15 weeks in utero.

Also see: Nine dangerous newborn baby myths, busted by an expert

The lung sacs are filled with fluid 

At this time, the respiratory system is not fully formed, but breathing itself is not necessary because the mother is supplying all the oxygen via the umbilical cord.

That is why your baby can develop and exist in a watery environment and even be born into water safely. The breathing movements are actually necessary to exercise the muscles of the lungs (they need a lot of practice) so that they can take on the lifelong job of breathing.

These movements stimulate lung growth and are a challenge because the lung sacs are filled with fluid, but this challenge helps to build strong muscles.

During the second trimester, breathing movements increase and in the third trimester they become the most important exercise for your baby.

Chatback:

Share your stories and questions with us via email at chatback@parent24.com. Anonymous contributions are welcome.

Don't miss a story!

For a weekly wrap of our latest parenting news and advice sign up to our free Parent24 newsletter.

Follow us, and chat, on Facebook and Twitter.

We live in a world where facts and fiction get blurred
Who we choose to trust can have a profound impact on our lives. Join thousands of devoted South Africans who look to News24 to bring them news they can trust every day. As we celebrate 25 years, become a News24 subscriber as we strive to keep you informed, inspired and empowered.
Join News24 today
heading
description
username
Show Comments ()
Editorial feedback and complaints

Contact the public editor with feedback for our journalists, complaints, queries or suggestions about articles on News24.

LEARN MORE