I don‘t know in USA if the father and the mother all D negative, whether the mother will receive prophylaxis or not. I said that just because I remember some book said it need not. In China we will routinely test D antigen not E e C c, so some Rhnull will be treated like D negative. If one of the parents is D negative with normal RHAG, the other is Rhnull of the regulator type, then the baby mybe a D positive. On 8 month do not give the prophylaxis,then immune the mother.