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here - Health Promotion Agency

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How the baby develops<br />

The umbilical cord<br />

The umbilical cord is the baby’s lifeline, the link between<br />

baby and mother. Blood circulates through the cord,<br />

carrying oxygen and food to the baby and carrying waste<br />

away again.<br />

The placenta<br />

The placenta is rooted to the lining of the womb and<br />

separates the baby’s circulation from the mother’s. In the<br />

placenta, oxygen and food from the mother’s bloodstream<br />

pass across into the baby’s bloodstream and are carried to<br />

the baby along the umbilical cord. Antibodies, giving<br />

resistance to infection, pass to the baby in the same way,<br />

but so too can alcohol, nicotine and other drugs.<br />

The amniotic sac<br />

Inside the womb the baby floats in a bag of fluid called<br />

the amniotic sac. Before or during labour the sac, or<br />

‘membranes’, break and the fluid drains out. This is<br />

called the ‘waters breaking’.<br />

Week 14<br />

ACTUAL SIZE HEAD TO BOTTOM<br />

ABOUT 85 MM<br />

WEEKS 10–14<br />

30<br />

Just 12 weeks after conception the<br />

fetus is fully formed. It has all its<br />

organs, muscles, limbs and bones,<br />

and its sex organs are well<br />

developed. From now on it has<br />

to grow and mature.<br />

The baby is already moving about,<br />

but the movements cannot yet be felt.<br />

By about 14 weeks, the heartbeat<br />

is strong and can be heard by<br />

using an ultrasound detector. The<br />

heartbeat is very fast – about twice<br />

as fast as a normal adult’s heartbeat.<br />

At 14 weeks the baby is about<br />

85 mm long from head to bottom.<br />

The pregnancy may be just<br />

beginning to show, but this varies<br />

a lot from woman to woman.

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