The Mother of a Newborn Boy Tells You That Her

The mother of a newborn boy tells you that her baby's breasts are swollen and sometimes look as if they are leaking milk. It is most appropriate to tell her that the

A) enlargement and leaking are caused by maternal hormones and will likely resolve without treatment.
B) infant may have a congenital heart defect.
C) infant may need genetic testing.
D) infant needs ultrasonography of the breasts to exclude a pathologic cause.
E) infant may have mastitis.