By the fourth month of prenatal development the fetus is capable of reflexive movements and is able to move its arms, legs, and head.

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By the fourth month of prenatal development, the fetus has developed enough to be able to move its arms, legs, and head in reflexive movements. This is known as quickening, and it is one of the earliest signs of fetal movement. However, these movements are not yet under conscious control and are still involuntary.

By the Fourth Month of Prenatal Development the Fetus Is