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Stages of birth:
1. Uterine contractions
2. The baby's head moves through the birth canal
3. Afterbirth when placenta, umbilical cord, and other membranes are detached and expelled

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9 month gestational period spans the period of roughly 2 weeks, the zygote from fertilization to implantation; from about the 3rd week to the 8th week, the period of the embryo is when most of the body's organ systems and structures are being formed; from the 9th week until birth, the period of the fetus is when the reproductive system forms, the brain and nervous system continue to develop, and the fetus gains in body weight.

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The man's sperm fertilizes a women's egg called an ovum. The ovum contains 23 chromosomes and a sperm contains 23 chromosomes.

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During fertilization, the sperm generates the outer membrane of the ovum and then penetrates the nucleus. A fertilized ovum is called a zygote.