Darkside of Medicine

Foetal development occurs through a series of carefully coordinated stages, with different organs and body systems forming at different times during pregnancy. Because development is not uniform throughout pregnancy, the effects of a teratogen can vary depending on when an exposure occurs.

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Understanding these stages helps explain why some exposures may have little effect, while others can influence growth, development, or long-term health. The timeline below highlights key stages of fetal development and the periods when developing structures may be most vulnerable to disruption.

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I think this second version would work particularly well immediately above an infographic or developmental timeline.