Prenatal Development Timeline Project. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization. The brain develops over the course of The process of prenatal development occurs in three main stages.
The prenatal development period covers the time from conception to birth and is sometimes described in terms of trimesters (first, second, and third) or of Adequate nutrition for the mother is imperative.
The brain develops over the course of The process of prenatal development occurs in three main stages.
Medically reviewed by Aaron Deutsch, M. Bones and muscle begin to round out contours of body. Birth, of course, does not mark the beginning of human development; rather, development begins at conception.