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Conception begins at the moment that a man's sperm reaches a woman's egg, which is known as a ovum. Each egg and sperm carry 23 chromosomes. 44 of these chromosomes are matched in a pair in the nucleus of the egg, while the other 2 chromosomes are connected and utilized to determine the baby's gender. This combination forms the zygote. In order to fertilize the egg, the sperm penetrates the outside of the ovum and makes its way into the nucleus. This begins the chain reaction that leads to prenatal development.

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The period of the zygote typically occurs for a duration of 2 weeks. These two weeks occur from the moment of conception until the beginning of the third week of pregnancy. It attaches the cell to the uterine wall and splits to form the placenta and embryo, which will hold the baby.

The period of the embryo occurs between the third and eighth week of the mother's pregnancy. During this period, the baby's body is formed along with the organ systems.

The period of the fetus, which is the longest span of the pregnancy, lasting from the 9th week until the birth of the baby. The fetus forms the reproductive systems, gains body weight, limbs, and also continues to develop the brain and nervous system, during this period.

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In the beginning of the birth process, the mother's cervix begins to dilate to prepare for the baby.

The child then faces the cervix and makes its way down the birth canal.

When the cervix is 10 centimeters dilated, the baby's head is in the birth canal and is ready for the mother to begin pushing the child out.

When the child comes out, the placenta, umbilical cord, and other membranes are detached from the baby.

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Broderick, P. Blewitt, P. (2015). The life span: human development for helping professionals. 4th Edition.