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Fetal Development: How Your Baby Grows

Understand more about what's going on with your growing pregnancy bump

Posted: 24 March 2009
by ThinkBaby

As well as keeping yourself healthy, one of the things that can help you to have a happy pregnancy is understanding what's going on in your womb.
So, how is your baby doing in there?

Your growing baby, at a glance
Eyes These begin to develop in the first four weeks, with eyelids beginning at around week eight. The eyes start to open in week 28. Eyelashes and eyebrows become prominent in week 16.

Heart The heart starts to beat at 22 days, but it’s so small it’s still hard to hear it beating! It’s fully formed at just eight weeks, and fully developed at 11 weeks.

Lungs, kidney and bladder These begin to form and develop in week eight.

Spine The neural tube, which evolves into the spine, grows in the first six weeks. (This is why, if possible, it's great to take folic acid while you are still trying for a baby.)

Arms and legs These form in week seven, with ankles and wrists developing in week 10. Fingernails and toenails begin to appear at week 12, with the digits moving freely at week 16.

Nose The nose becomes noticeable in week seven, with nostrils developing at nine weeks!

Skeleton This draws upon calcium deposits to form at week 10.

Ears These develop at 11 weeks, and by week 21 your baby can hear everything that’s going on!

For a more detailed look at how your baby is doing, week by week, and to find out about how your body changes, don't miss our Week by Week Guide to Fetal Development.
You can also get weekly update emails.

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Discuss this story

This has been quite helpful. i now know whats happening inside me and what to expect. Lovely articles

Posted: 11/05/2009 at 10:49

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