Whether the child foreskin jerk down is normal or not should be combined with the age as well as the severity. 1. Normal phenomenon: physiological phimosis occurs within three years of age, the child is still in the developmental period, there may be symptoms of the foreskin jerked down, as the child grows most children can be relieved on their own. 2. Phimosis: refers to the narrow opening of the foreskin, the foreskin can not be turned up to reveal the head of the penis, will lead to the child’s foreskin can not be jerked down. Patients with phimosis may have difficulty urinating, slow urine flow and other symptoms, in addition, patients may also appear phimosis, urinary tract infections, pain in the foreskin and other symptoms. 3. Hyperemesis gravidarum: It means that the foreskin of the penis of some men completely covers the head of the penis and the external opening of the urethra. The foreskin can be freely flipped to reveal the glans, but if there is a circumcision, it will also lead to the child’s foreskin can not be jerked down. Children’s foreskin can not be jerked down is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment, under the guidance of the doctor to avoid the development of the disease.