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The fetal period.
Pregnancy
the longest stage is the fetal stage.
Fetal Development period. Whereas the first 8-9 weeks is embryonic development or embryogenesis.
According to my college textbook, a critical period is an optimal period occurring in animals shortly after birth when certain events must take place to facilitate proper development.
Critical period refers to the time during a child's development when they are more easily taught things. Essentially, when a particular skill is most readily acquired.
The site of fetal development is the uterus. It refers to an organ that is found in the lower body of a woman or a female mammal.
Embryology
uterus
There is no way to sum up fetal development: from conception to development to what problems may occur and when; one paragraph wouldn't even begin to cover it all.
Compare embryonic growth and fetal development in single and multiple pregnancies, including the incidence of complications and infant mortality.
pregnancie