The major body structures and organ systems form during

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During the first trimester of pregnancy, the major body structures and organ systems of the fetus form. This includes the development of the brain and nervous system, heart and circulatory system, lungs and respiratory system, digestive system, and reproductive system. The first trimester is a critical period of fetal development, as any disruptions or abnormalities during this time can have significant impacts on the health of the baby later in life.

The Major Body Structures and Organ Systems Form During