Growth of head circumference

Average HC at term: males 35 cm, females 34 cm
0-3 mos: 2 cm/month
4-6 mos: 1 cm/month
7-12 mos: 0.5 cm/month
Average HC at 1 y/o: males 47 cm, females 46 cm

1-3 years: 0.25 cm/month
4-6 years: 1 cm/year

Preemies
0-2 mos: 1 cm/week
2-4 months: 0.5 cm/week
>4 months: see full term