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Short title: Birth to 36 months: Boys, Head circumberence-for-age and Weight-for-length percentiles: Image title: CDC Growth Charts: United States: Author
The height, weight, and head circumference of a child can be compared to the expected parameters of children of the same age and sex to determine whether the child is growing appropriately. Growth charts can also be used to predict the expected adult height and weight of a child because, in general, children maintain a fairly constant growth curve.
Reference charts for adult head circumference also generally feature homogeneous samples and fail to take height and weight into account. [6] One study in the United States estimated the average human head circumference to be 57 centimetres (22 + 1 ⁄ 2 in) in males and 55 centimetres (21 + 3 ⁄ 4 in) in females.
The greatest circumference of the head, which corresponds to the plane of the occipitofrontal diameter, averages 34.5 cm (13.6 in), a size too large to fit through the pelvis without flexion. The smallest circumference, corresponding to the plane of the suboccipitobregmatic diameter, is 32 cm (13 in).
Pediatric growth is measured in height or length, head circumference (used from 0–2 years of age), weight, [3] and BMI (used starting at 2 years of age). [4] It is determined by multiple factors including genetic, environmental, hormonal, nutritional and psychosocial factors.
Cephalic index viewed from above the head. The cephalic index or cranial index is a number obtained by taking the maximum width (biparietal diameter or BPD, side to side) of the head of an organism, multiplying it by 100 and then dividing it by their maximum length (occipitofrontal diameter or OFD, front to back). The index was once used to ...
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Head size increases slowly; grows approximately 1.3 cm (0.51 in) every six months; anterior fontanelle is nearly closed at eighteen months as bones of the skull thicken. Anterior fontanelle closing or fully closed, usually at the middle of this year. Chest circumference is larger than head circumference. Legs may still appear bowed.