Microcephaly is defined as head circumference _________
*Microcephaly is defined as an occipitofrontal circumference more than 3 standard detions (SD) below the mean for given age, sex and gestation. *Causes are structural brain malformations, inherited syndromes, congenital or acquired infections, hypoxic ischemic insults and rarely metabolic disorders. Isolated inherited microcephaly is autosomal recessive. Reference : page 36 Ghai Essential Pediatrics 9 th edition
< 1SD for age and sex
< 2SD for age and sex
< 3SD for age and sex
< 4SD for age and sex
New born infants