Fetal development occurs over trimesters of pregnancy. two three five seven

Answer – Three Trimesters
 The development a fetus occurs over three trimesters of pregnancy. The nine months gestational period in humans is divided into three stages of equal length; the first three months form the first trimester, the fourth to sixth months form the second trimester, and the seventh to ninth month form the third trimester.

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Ithink it’s ritalin