Pediatric head circumference measurement must first be prepared with a soft ruler, the child can be used in a sitting position or while holding the head circumference. To find a few marker points, to find the bilateral arch of the eyebrows, that is, the horizontal line of the eyebrows, another is the back of the skull occipital bone, the occipital bone bulge, is the most prominent part of the occipital nodes, after finding these points, is the level of the eyebrows on both sides, along the upper edge of the ears, circular around to the occipital bone bulge place, the occipital nodes place, the circumference of a circle is the child’s head circumference, is the normal measurement method This is the normal measurement. If the head circumference is too large, there is a possibility of hydrocephalus, and if the head circumference is too small, there is a possibility of premature closure of the cranial suture. Therefore, it is important to know the normal head circumference, for example, a newborn baby is about 34cm, and by the age of one year is about 46cm, about a value, and if the head circumference is too large or too small, we should seek medical consultation in time to clarify what the cause is and give timely treatment.