Fertilisation and embryo developmentFetal development

Gametes are sex cells. each contains half the information required to make a complete human being. When a sperm and egg join, the egg is fertilised and a baby starts to develop.

Part ofScienceInheritance

Fetal development

Shows the placenta, uterus, fetus, umbilical cord, amniotic fluid, cervix and vagina
Figure caption,
A fetus develops in the uterus into a baby ready to be born

The fetus relies upon its mother as it develops. These are some of the things it needs:

  • protection against knock and bumps, and temperature changes
  • oxygen for respiration
  • nutrients (food and water)

The developing fetus also needs its waste substances removing.

The fetus is protected by the uterus and the , a liquid contained in a bag called the .

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