Thanks for your query
Yes, they can be teratogenic to the baby ,although their role as teratogens is not established.
Congenital defects may have genetic, infectious, toxic, or traumatic causes. In most cases, no certain cause can be identified. So in order to prevent congenital anomalies, one must reduce exposure to potential teratogens before pregnancy
is recognized (i.e. preconceptionally and in the first few weeks of pregnancy). Folic acid
should be started before pregnancy.
Hope i helped you..