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After 9 months of growing, developing, and learning the baby is ready to be born. The mother's body and baby prepare for birth. Even thought the brain continues to develop throughout adolescents and on, the baby has already learned so much. During the past 9 months the baby has grown from a collection of cells replicating and dividing that has been learning about the world it will live and learn in.

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During the prenatal phases of development there are many factors that effect development known as coaction. Heredity and the environment are  linked even before the baby is born. The environment can influence and manipulate the genetic makeup to better prepare the embryo and later fetus for the environment it will be born into.

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The embryo continues to divide and replicate. The individual cells begin to separate into the different cells that make up the systems of ourselves like central nervous, muscles, organs, and brain. This specialization of cells is known as epigenesis.

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The cells carry the chromosomes, and once conception takes place these cells begin to divide. Over the first 2 weeks after conception the organism migrates down the fallopian tubes to attach to the uterine wall. Now it is referred to as an embryo.

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The zygote has 46 chromosomes with one pair being the sex chromosomes. XX-Female and XY-Male.

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The sperm meets the ovum. Once the sperm reaches the ovum's nucleus it becomes a fertilized egg known as a zygote

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Broderick, P.C. & Blewitt, P. (2015). Epigenesis and the Brain: The Fundamentals of Behavioral Development. In The life span: Human development for helping professionals. Boston: Pearson.