The normal value of follicle stimulating hormone at the age of 9 is 1-9 U/L, not exceeding 10 U/L. The specific value of follicle stimulating hormone varies at different times of a woman’s menstrual cycle, and in the case of girls as young as 9 years old, some menstruation has not yet started, but some with early sexual development may have already started, so parents are more concerned and will take their children to the hospital to have their sex hormone levels checked. If precocious puberty is detected, the child should see a specialist for consultation and treatment. Folliculopoietin is a hormone necessary for follicle development. Its main physiological role is to promote the proliferation and differentiation of antral follicles and sinus follicle granulosa cells, secrete follicular fluid, and promote follicle growth and development.