The period of gestation when the basic components of each of the major organ systems appear is the second trimester.
Gestation is the period from the fertilization of the ovary till the birth of the baby. During this phase, a single cell divides and grows to form a complete multicellular organism, with all the organs and organ system. In humans, gestation period is of nine months.
Trimester is a period of three months. This term is commonly used during pregnancy. In pregnancy there are three trimesters. First trimester with first, second and third month; second trimester includes fourth, fifth and sixth months; and lastly third trimester includes seventh, eighth and ninth months.
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