As well as the mother is able to pass nutrients and other beneficial substance, It is possible for the mother to pass harmful substances that can be very bad for the fetus.
Almost all the substances that the mother ingest or inhales can be passed through the placenta. This is specially significant in the first nine weeks, when the embryo is very sensitive to environmental factors.
Teratogens is the name given to any substance that causes structural abnormality to the baby. Cigarette smoke, for example, prevents enough oxygen to reach the baby.
One of the most damaging teratogens is called alcohol. Alcohol can affect the fetus brain, nervous system and physical development. The term that is used to describe all alcoholic disorders is called FASD. This includes the fetal alcohol syndrome (FAS).
Some prescriptions of medicines are consider teratogens.
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