What is a normal head circumference for a child?

A normal head circumference for a child varies by age, but generally ranges from about 33 to 37 centimeters at birth and increases to approximately 46 to 48 centimeters by the age of one. By age two, the average head circumference is around 48 to 50 centimeters. It's important to monitor head growth as part of overall development, and any significant deviations from these averages should be discussed with a healthcare professional.