Answer:
Alcohol, cigarettes and recreational drugs are known teratogens.
Step-by-step explanation:
Alcohol affects the fetus's central nervous system.
Smoking―Women who smoke during pregnancy are more likely to have a baby with an orofacial cleft than women who do not smoke.
Use of certain medicines―Women who used certain medicines to treat epilepsy, such as topiramate or valproic acid, during the first trimester (the first 3 months) of pregnancy have an increased risk of having a baby with cleft lip with or without cleft palate, compared to women who didn’t take these medicines.