Pediatrics The most common cause of ambiguous genitalia in a newborn is – A 21 hydroxylase deficinece B 11 beta - hydroxylase deficiency C 17 alpha - hydroxyalse deficiency D 3 beta - hydroxysteroid deficiency 💡 Explanation The most common cause of ambiguous genitalia in a newborn is - ✓ Correct Answer: A. 21 hydroxylase deficinece