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How the baby develops<br />

Week 30<br />

ACTUAL SIZE HEAD<br />

TO BOTTOM ABOUT 33 CM<br />

but it can be difficult to find the<br />

right place. The baby is now<br />

covered in a white, greasy<br />

substance called ‘vernix’. It is<br />

thought that this may be to protect<br />

the baby’s skin as it floats in the<br />

amniotic fluid. The vernix mostly<br />

disappears before the birth.<br />

At 24 weeks, the baby is called<br />

‘viable’. This means that the baby<br />

is now thought to have a chance of<br />

survival if born. Most babies born<br />

before this time cannot live<br />

because their lungs and other vital<br />

organs are not well enough<br />

developed. The care that can now<br />

be given in neonatal units means<br />

that more and more babies born<br />

early do survive.<br />

At around 26 weeks the baby’s<br />

eyelids open for the first time. The<br />

eyes are almost always blue or dark<br />

blue. It is not until some weeks<br />

after birth that the eyes become<br />

the colour they will stay, although<br />

some babies do have brown eyes at<br />

birth. The head to bottom length<br />

at 30 weeks is about 33 cm.<br />

WEEKS 31–40<br />

The baby is growing plumper,<br />

so the skin, which was quite<br />

wrinkled before, is now<br />

smoother. Both the vernix<br />

and the lanugo begin to<br />

disappear.<br />

By about 32 weeks<br />

the baby is usually<br />

lying downwards<br />

ready for birth.<br />

Some time before<br />

birth, the head may<br />

move down into the<br />

pelvis and is said to be<br />

‘engaged’, but sometimes the<br />

baby’s head does not engage<br />

until labour has started.<br />

32

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