Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Fetal hydantoin syndrome ?
    ### Response:
    Fetal hydantoin syndrome is a disorder that is caused by exposure of a fetus to phenytoin, a drug commonly prescribed for epilepsy. Not all infants exposed to phenytoin will be affected with the disorder. Symptoms in affected individuals may include abnormalities of the skull and facial features, growth deficiencies, underdeveloped nails of the fingers and toes, and/or mild developmental delays.
    