Sleep/wake cycles factor is not one that can affect the fetus during prenatal development.
Prenatal Development
Prenatal development refers to the development of the embryo and foetus during the gestation of a viviparous mammal. Prenatal development begins with fertilisation in the germinal stage of embryonic development and continues until birth in the foetal stage. Prenatal development is also known as antenatal development in human pregnancy. Following fertilisation, human embryo growth continues as foetal development. The embryo has gained its basic form by the end of the tenth week of gestational age and is referred to as a foetus. The following stage is foetal development, during which numerous organs fully develop. This foetal phase is discussed thematically (by organ) as well as chronologically (by time), with significant events listed by gestational age.
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