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How does the teratogen moves from mother to baby?

How does the teratogen moves from mother to baby?
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The placenta connects the mother's uterus to the fetus. Blood travels from the mother to the fetus through placenta. It provides nutrition by carrying food and oxygen to the fetus through blood.

when a mother is exposed to a teratogen, her blood can carry these things to the fetus.

The placenta membrane is semi permeable and teratogens cross placenta by passive diffusion.

The factors which determine the crossing of teratogen from placenta are molecular weight, lipid solubility, polarity, protein binding etc.

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