2 months old has head circ 39.3 cm, at birth it was 34.5, is it normal?

If a girl, head cir-: cumference was 60th%ile at brth and 95th%ile at 2 mos. 0 days. If a boy, 50th%ile at birth; 60th%ile at 2 mos. 0 days. Have the same person in the pediatrician's office measure with the same head circumference tape the same way every month x 3 to determine accelerated vs. normal velocity of growth. Use developmental screens on firstsigns.org. See pediatrician sooner if concerned.