Location

A single cell called a zygote is formed if an egg fuses with a sperm

Fallopian tube

The zygote begins to divide soon after it has been formed

The cluster of dividing cells, called a morula, grows as it travels along the fallopian tube

An embryo starts to form once the cluster of cells has embedded itself in the lining of the uterus wall

The zygote begins to divide soon after it has been formed

Fallopian tube

An unfertilized egg is released from an ovary

From egg to embryo

As the cells passing along the fallopian tube divide, their number doubles every 12 hours. When the cell cluster reaches the uterus, it contains hundreds of cells. Once embedded in the uterus lining, the cells start developing into an embryo.

Lining of the uterus

An unfertilized egg is released from an ovary

From egg to embryo

As the cells passing along the fallopian tube divide, their number doubles every 12 hours. When the cell cluster reaches the uterus, it contains hundreds of cells. Once embedded in the uterus lining, the cells start developing into an embryo.

Lining of the uterus

How the baby is nourished

An unborn baby depends on its mother to supply it with oxygen, nutrients, and antibodies against infection, and to remove its waste products. These substances pass between the mother's blood and the baby's blood inside the placenta, an organ that is attached to the uterus lining and is connected to the baby by the umbilical cord. In the placenta, the mother's and baby's blood supplies are brought close together, although they do not actually mix.

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