<prompt> Mean head circumference at bih is?33-35 cm35-37 cm37-39 cm39-41 cm  <response>: Head circumference: Measured with a nonstretchable tape passing through the maximum point of occipital protuberance posteriorly and at a point just above the glabella anteriorly. If the head circumference is more than expected, always measure the both parents; head circumference, for benign familial macrocephaly is common. At bih, it is around 34 cm. HC increases by 2 cmmonth for the first 3 months, 1 cmmonth for next three months and 0.5 cm per month for next 6 months. Ref: Ghai Essential Pediatrics, ninth edition. pg. no. 35. 