When Does Teratogenesis Occur?

Teratogens are thought to have the ability to effect the fetus about 10 to14 days after conception. During the development of a baby, there are certain organs forming at certain times.

Which stage of pregnancy is most susceptible to teratogens?

The embryonic period, during which organogenesis takes place, occurs between implantation at around 14 days to around 60 days postconception. This is usually the most sensitive period to teratogenesis when exposure to a teratogenic agent has the greatest likelihood of producing a malformation.

What stage are teratogens most harmful?

Time of exposure: Teratogens are most harmful early in pregnancy, starting about 10 to 14 days after conception to about 8 weeks into pregnancy.