File:Human-critical periods of development.jpg: Difference between revisions

Dark Orange = major abnormality | Light Orange = minor abnormality

In general, the effects for each system are more severe (major anomalies) in the embryonic period during organogenesis in the first trimester.

Later teratogen exposure are less severe (minor anomalies) in the fetal period during continued growth and differentiation in the second and third trimester.

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