Most common cause of ambigious genitalia in a female child is:
“CAH due to 21 hydroxylase deficiency is the most frequent cause of sexual ambiguity and the M/C endocrine cause of neonatal death.”
Ambiguity of sex at birth—"Cases of ambiguity of sex detected at birth are due to adrenogenital syndrome unless proved otherwise".
Placenta steroid sulfatase deficiency
Fetal aromatase deficiency
Wnt4 mutation
Congenital adrenal hyperplasia