Fetal development occurs most rapidly in the

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The first trimester of pregnancy is the period from conception to 12 weeks of gestation. During this time, the fertilized egg undergoes rapid cell division and differentiation, giving rise to all major organs and structures of the body. This period is critical for the development of the nervous system, heart, and limbs. By the end of the first trimester, the fetus is about 3 inches long and weighs about 1 ounce. The second and third trimesters are characterized by further growth and maturation of the organs and systems, but the most rapid development occurs in the first trimester.

Fetal Development Occurs Most Rapidly in the