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Brain development occurs rapidly after birth due to the formation of synapses. Development in all areas continues through adulthood.

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Atypical development occurs when proper prenatal care is not administered, teratogens are consumed during pregnancy, or if there are defective gene alleles.

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For typical development to occur, the genome as well as the environment should be considered. Proper prenatal care can help fast a typical development.

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Around the 3rd week after conception, the brain begins to develop and neurons being reproducing. By the fourth month, the brain's structure is developed. By the 15th week, sounds can be heard, and by the 25th week, eyes can open and close.

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The nucleus of the zygote contains 46 chromosomes; 23 from the sperm and 23 from the ovum. These chromosomes are made up of DNA. Genes are composed of functional combinations of DNA. Genes that bond to form alleles can influence inherited traits in a child.

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When a sperm enters into the nucleus of the ovum, it disintegrates and the fertilized ovum becomes a zygote.

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As mitosis occurs in the zygote, the organism grows and travels down the Fallopian tubes. This process and the development of the zygote can take about two weeks. Then, it attaches to the uterine lining and becomes an embryo. During the next six weeks, the eyes, heart, ears, limbs, brain, palate, and external genitals begin to develop.

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Birth typically occurs after 36 weeks. Children can be delivered vaginally or through a cesarean delivery.

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After the embryo is developed, for the next 28 weeks the fetus will grow and develop.

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During conception, a man's sperm fertilizes with a woman's ovum.