Pediatrics Microcephaly is defined as A Head circumference < -3SD below the mean for age and sex B Head circumference < -2SD below the mean for age and sex C Head circumference below 10th percentile the mean for age and sex D Head circumference below 15th percentile the mean for age and sex 💡 Explanation Microcephaly is defined as ✓ Correct Answer: A. Head circumference < -3SD below the mean for age and sex