Pregnancy

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Pregnancy describes the condition of a mother carrying her unborn offspring. A woman becomes pregnant when a baby is implanted into her uterus. In humans, pregnancy lasts approximately nine months, after which the baby is born via the birth canal.

Stages of Pregnancy

Implantation

Pregnancy begins with the implantation of the conceptus into the wall of the uterus. This contains the cells that will develop into the baby as well as those which will go on to form the placenta and membranes.

Embryonic Stage

The embryonic stage consists largely of the differentiation of cells into the tissues of the body. It is divided up into 23 carnegie stages which represent different stages of development.

Fetal Stage

The fetal stage mainly consists of the growth of the foetus and continued development of internal systems.

See Also