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
Answer is A. Macrocephaly : Head circumference > 2SD above the mean for age and sex