The head circumference of a six-month-old female baby of 39cm is within the normal range but slightly lower, and it should be noted that when evaluating the head circumference, it is necessary to correct the gestational age to the expected date of birth, for example, a 36-week preterm baby born at six months of age will only be five months old after correcting the gestational age. A comparison needs to be made with the head circumference range of a five-month-old baby.
According to the Chinese children’s growth and development reference standards, different months of age baby head circumference reference range is different, with the increase in the age of the month, six months of age female baby head circumference of the normal reference range of 38.9-46.5cm. so six months of female baby head circumference of 39cm belongs to the normal range of the lower level.
Head circumference, like height and weight, is an important indicator of a baby’s development and health, and the size of the head circumference is mainly affected by heredity and disease. Head circumference is mainly related to vitamin D deficiency rickets, hydrocephalus, genetic metabolic diseases, etc. Head circumference is mainly related to intrauterine infection, hypoxia, cerebral dysplasia, chromosomal and genetic abnormalities and other genetic metabolic diseases.
Therefore, the head circumference of female babies of six months of age 39cm belongs to the normal range, but also need to carry out regular child health checkups, according to the genetic, head circumference development speed assessment judgment, if there is any abnormality can be targeted intervention under the guidance of pediatrician.