Biology/Systems/Reproductive System

From Wikibooks

How are babies made?

In humans there are two sexes: Men and Women. Babies are made when cells called sperm (produced by men) get together with cells called eggs (produced by women) in a process called fertilization. When the cells combine, they form a new cell, called a zygote (zy sounds like eye. gote sounds like goat) which has all it needs to make a new man or woman. The zygote will make a baby like his mother and father.

Where do babies come from?

A baby grows in its mother.

Babies come from their mother. To make a baby, the father must put his sperm into the mother's body. This is called having sex. The man puts his penis into the womans vagina and the sperm cells swim into the mother's body. Fertilization happens in the mother. The new zygote grows into a ball which will stick to the mother's womb. This ball grows into a baby.

Nine months later (266 days after fertilization) a new baby will come out of the mother's vagina in a process called birth.


cell - Things that are alive are made of little boxes called cells.

womb - The place in a body where a baby grows. The word woman means man with a womb.

zygote - The one cell made from a sperm cell and an egg cell that will grow into a person.

sperm - A sex cell made by a man.

egg - A sex cell made by a woman.

fertilization - When sperm and egg get together and make a zygote.