Which period of prenatal development is considered the critical period and also a time in which teratogens can have a profound effect that endure into adulthood?

Question

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The embryonic period (which lasts from the end of the second week to the eighth week after conception) is considered the critical period of prenatal development. During this time, the major organ systems are developing and are most vulnerable to the effects of teratogens, which can lead to lifelong complications. While teratogens can also have negative effects on fetal development during the fetal period (which lasts from the ninth week after conception until birth), it is to a lesser extent and the organs are already formed.

Which Period of Prenatal Development Is Considered the Critical Period