Learning outcomes:
1. Explain how a zygote develops into
a baby
2. Name and describe some of the
features found in the womb of a
pregnant woman
This embryo
is 6 weeks old
This embryo
is 7 weeks old
This embryo
is 8 weeks old
24 mm
4 weeks – 6mm
8 weeks - 24mm
Placenta –
Connection
to the wall
of the
womb
Sac of
Amniotic fluid
to protect the
developing
baby
Umbilical cord
to supply the
baby with
Embryo
food
and
(now called
oxygen from
a foetus)
its
mother
12 weeks – 7cm long
Structure
Function
Supplies the baby with food and
oxygen from the mother
Protects developing baby from any
bumps
Connection to the wall of the uterus
Sperm
Z____
Egg
E____
F____
Baby!
Structure
Function
Umbilical cord Supplies the baby with food and
oxygen from the mother
Amniotic fluid
Protects developing baby from any
bumps
Placenta
Connection to the wall of the uterus
Sperm
Z____
Zygote
Egg
E____
Embryo
F____
Fetus
Baby!
Learning outcomes:
1. Name a substance that can affect
the growth of a baby
2. Describe what effect this
substance has on the baby



Alcohol can also affect the growth and
development of babies.
If a woman drinks whilst pregnant, the baby
could suffer from Fetal Alcohol Syndrome.
The symptoms include:
◦
◦
◦
◦
◦
restricted growth
lower birth weights
abnormal brain development (learning difficulties)
Facial abnormalities
heart defects


Collect a green Int 1 textbook
Read page 55 (or use your own general
knowledge!) and answer the following questions in
sentences:
1.
2.
3.
4.
5.
6.

Name three substances found in cigarette smoke.
What gas does the baby receive less of, if the mother smokes
during pregnancy?
Explain why this happens.
What effect does nicotine in the mother’s bloodstream have
on the baby?
What effect does smoking whilst pregnant have on the baby’s
birth weight?
What effect does smoking whilst pregnant have on the baby’s
intelligence?
Complete Q 12 on page 64