Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Fetal and neonatal alloimmune thrombocytopenia ?
    ### Response:
    Fetal and neonatal alloimmune thrombocytopenia (NAIT) is a condition where a fetus or newborn experiences severe thrombocytopenia (low platelet count). NAIT occurs when the mother's immune system develops antibodies against antigens on the fetal platelets, which are inherited from the father and different from those present in the mother.
    