Worried Your Baby Girl Will Adopt 'Masculine Behavior'? There's a Drug For ThatKatie J.M. Baker8/17/12 4:00pm62EditPromoteGo to permalinkCongenital adrenal hyperplasia (CAH) is a rare disorder (it occurs in about 1 in 10,000 infants) that can cause girls to develop ambiguous genitalia. Some doctors think CAH also induces "masculine behavior," i.e. a disinterest in having children and an interest in dating other women.