here - Health Promotion Agency
here - Health Promotion Agency
here - Health Promotion Agency
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
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.