When the embryo is implanted in the wall of the uterus, it is ready to develop into a baby. The embryo needs food and oxygen to grow. It also needs protection.
First, it is protected by a sac called amnion, which fills with liquid.
Then, the placenta forms. It gives the embryo nutrients and oxygen from the mother.
The embryo is connected to the placenta by the umbilical cord.
After about eight weeks, when the main structures and organs have formed, the embryo is called a foetus.
First, it is protected by a sac called amnion, which fills with liquid.
Then, the placenta forms. It gives the embryo nutrients and oxygen from the mother.
The embryo is connected to the placenta by the umbilical cord.
After about eight weeks, when the main structures and organs have formed, the embryo is called a foetus.
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