1. The Developing Foetus

2. The embryo is about 6mm long and has a heart, brain,
spinal cord and arm and leg buds.

3. 25mm long
weighs 2g.
Most of the main
organs,arms and
legs are forming.
Now called a
foetus.

4. 75mm long
weighs 18g.
Main organs have
fully developed.
Nails are growing
on the fingers and
toes. Ears,eyelids
and teeth have
formed.

5. 160mm long
weighs 140g
External genital
organs can be
seen. Covered in
fine hair.

6. 280mm long
Eyes are open
and foetus has a
strong desire to
suck.

7. 370mm long
Has a good chance
of survival if born
at this stage.

8. 50cm long
weighs between kg
Head faces
downwards and
foetus is ready to
be born.

9. TWINS
When more than one baby grows in the womb at a time it is known as a multiple birth. When twins are born they can either look the same or not look alike at all.
Meet Shane and Mark. They are identical twins.
These twins look the same because the egg splits in half after fertilisation. They must be the same sex.
Meet Sally and Peter.
They are fraternal twins.
These two do not look at all alike. In their case two eggs were released at the same time and each one was fertilised by a different sperm thus producing two different individuals. They could be different sexes like Sally and Peter.