What should the head circumference and fontanel be for a 50-day-old baby?

Patient's question:

No

Doctor's answer:

The average head circumference of newborns is 34 centimeters. The growth rate of head circumference is relatively fast in the first six months after birth, but the overall variation is still small. From newborn to adulthood, the difference in head circumference is only about 10 to 20 centimeters.