What is another name for the uterus?
Human body
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The first cells
After 36 hours, the cell has
divided and made an exact
copy of itself. These are the
first two cells of a baby.
Making a baby
Eggs are the biggest cells in
the human body. But they
are still very small – ten
would fit across a pinhead.
Sperm race
Millions of sperm swim towards
the egg cell. Only one sperm can
join with the egg to make a new cell.
By the time the
baby is born,
the fertilized cell
will have become
100 trillion cells.
Sperm are amazing
viewed under a microscope.
They look like tiny tadpoles. You
can see their tails wriggling as
they swim.
You need a mother and a father to
make a baby. The mother’s body does
most of the work, but the father also
has an important job – his sperm joins
with the mother’s egg and a new
life begins...
