Oral medication to delay menstruation is not recommended for children who are not experiencing discomfort during their menstrual period, as oral medication may have adverse effects such as nausea, dizziness, and menstrual disorders. If there is obvious discomfort during the menstrual period and the child needs to delay menstruation for the midterm exams, oral contraceptives such as desogestrel ethinyl estradiol tablets or oral progestins such as progesterone can be taken to delay the menstrual cycle. If you want to avoid menstruation during the midterm examination, you can take compound short-acting contraceptives such as deoxypregnene ethinyl estradiol tablets to inhibit ovulation or delay ovulation, so as to achieve the effect of delaying menstruation. If your child has regular periods, you can start taking them 5 days after the onset of menstruation and stop taking them after the midterm. The effect of delaying menstruation can also be achieved by using progesterone and other progestins to increase the level of progesterone in the body so that the uterine lining does not shed temporarily. Progesterone can be started 10 days before the next menstrual period and stopped after the midterm. It is recommended to consult a medical professional before using the drug to avoid unauthorized use of the drug to avoid adverse consequences.