For women of different ages, the normal range of follicle size on the 11th day has a certain gap, the details are as follows: first, between 20-23 years old, the diameter of the follicle on the 11th day of the follicle between 0.35-0.55 centimeters, for the age of the relatively small, the body’s function is not mature, especially the function of the ovaries, the follicle’s development is relatively slower, and the volume will be slightly smaller. Secondly, for women between the ages of 23 and 30, the diameter of the follicle on day 11 is between 0.6 and 0.68 centimeters, because the body of women in this age group is basically mature, especially the function of the ovaries, the development of the follicle will be more complete and adequate, and the follicle will be relatively large. Third, for women over 30 years of age, the size of the follicle on day 11 is between 0.48 and 0.51 centimeters in diameter, because as women age, the ovarian function begins to show a downward trend, and the size of the follicle will have decreased to a certain extent.