The size of the head of the fetus is not a criterion for the identification of male and female babies, and does not indicate whether it is a boy or a girl. Whether the fetus is a boy or a girl is determined at the time of fertilization and is related to the chromosome type of the embryo. The size of the head is a descriptive indicator of the size of the head of the fetus, and does not indicate the chromosome type of the fetus, therefore, the size of the head of the fetus does not indicate whether the fetus is a boy or a girl. If the head of the fetus is abnormally large, the cause should be clarified in time to exclude the presence of hydrocephalus and other serious malformations, and if necessary, induction of labor is feasible to avoid adverse pregnancy outcomes. Therefore, when the head of the fetus is too large, you should consult a doctor in time, under the guidance of a professional physician to avoid delaying the condition.