Human development begins when the sperm of the male and the female ovem are combined with a nutrient called zygote for the survival of the species.
Period Age (approximate)
Zygotic Two weeks from conception
Embryonic Two weeks to eight weeks
Fetal From eight weeks to birth
Zygotic Period
it is in contact with the uterine wall for about two weeks after fertilization. In some cases this period is known as the germinal period.
Embryonic Period
By this time of the growing organism, the organs have begun to form.
Fetal Period
During this period, the body's various systems and structures are developed and molded into a human baby.
The fetus is usually born after nine months of fertilization. The newborn is also known as the neonate.
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