The joint found in the skull would be Immovable joints
Nitrofurantoin is antibiotic drug commonly used to treat urinary tract infections in pregnant women because of its safety and effective use (the body quickly filters it out). It is not recommended to be used in late pregnancy due to the potential risk of hemolytic anemia in the newborn.
But, recent studies suggested that there is a possible association between congenital malformations following exposure to nitrofurantoin during the first trimester of pregnancy.
You should ask your teacher to be sure, but I think that you teacher meant like the mode of transmission.... Like genetically inherited and such.