Head circumference

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

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