How big is the head circumference of a three-and-a-half-month-old baby considered normal?

Patient's question:

No

Doctor's answer:

Three months of height and weight standards, boys' height is 59-68 cm, weight is 12-17 jin, head circumference is 39-44 cm, girls' height is 58-66 cm, weight is 11-16 jin, head circumference is 38-42.5 cm, you can use it as a reference.