The average head circumference at birth is 33-35 cm and grows about 2 cm per month. Head circumferences should be measured at each visit and plotted on a growth chart. Although head size often follows body growth, small infants may have large heads and vice versa. It is not unusual for the head circumference to cross percentiles during the first year of life, but if the infant has a large head, other family members heads should be measured and plotted and a full developmental assessment and examination should be performed.
Large heads are often a familial feature.
Evaluation History Developmental assessment Symptoms of increased intracranial pressure-lethargy, poor feeding, irritability, vomiting History of trauma, prematurity, infections. Family history of neurologic disorders Physical examination findings split sutures and bulging anterior fontanel prominent veins setting sun eyes Abnormal tone and increased DTRs thorough skin inspection including evaluation for midline spinal lesions. Intracranial bruits Retinal hemorrhages and evidence of chorioretinitis Pulse, blood pressure, respiratory rate Transillumination CT and MRI will help define hydrocephalus, congenital malformation, vascular lesions, subdural collections of fluid, and degenerative changes. Consultation of a neurosurgeon Etiology of Large Heads Normal infant with familial large heads. Hydrocephalus hemorrhage trauma Congenital- aqueductal stenosis, congenital malformations such as Arnold Chiari malformation and Dandy Walker cysts.