Transplacental

Transplacental means crossing the placenta. The placenta is the in-utero connection between the mother and the fetus. Transplacental means something (a drug, antibodies, an infectious agent, etc. ) crosses from the mother to the fetus before birth. This can be good in the case of antibodies that protect the newborn from disease early in life or bad if it is an infectious agent that transfers from mother to baby.