Maximum circumference of the head from Occipital protuberance to Supra orbital ridge on the forehead
• Newborn (at birth): 33-35 cm (34 cm)
• 0-3 months (first 3 months): 2 cm/month
• 3-6 months (next 3 months): 1 cm/month
• 6-12 months (next 6 months): 0.5 cm/month
• 1-3 year: 0.2 cm/month
|
Age |
Head Circumference (cm) |
|
At birth |
33-35 cm (At birth CC is about 3 cm less than HC) |
|
3 month |
40 cm |
|
6 month |
43 cm |
|
1 year |
46 cm (At 1 yr CC is almost equal to HC) |
|
2 year |
48 cm (Brain >90% developed) |
|
3 year |
49 cm |
|
4 year |
50 cm |
|
12 year |
52 cm (Adult size) |
CC - Chest circumference
HC - Head circumference
NOTE: >90% of brain growth are occur at by 2 year of age.
|
Age |
Chest & Head Circumference |
|
At birth |
CC < HC |
|
At 1 year |
CC = HC |
|
After 1 year |
CC > HC |