The pinch-leg syndrome, also known as emotional cross-leg syndrome, is a habitual maladaptive action in children characterized by pinching of the legs and constant rubbing of the perineum. It is more common in girls aged 1-3 years, with a higher incidence in girls than in boys. It usually occurs once in a few days, but in severe cases, it can occur several times in 1 d. The duration of the disease is several months to more than 1 year. The cause is not fully understood. Some scholars believe that it is a transient behavioral problem that occurs during the growth and development of infants and young children; some experts believe that it is related to neurological disorders and have found that the children have elevated urinary amino acids, decreased blood ferritin, and decreased activity of the iron-dependent enzyme monoamine oxidase due to iron deficiency, causing abnormal catecholamine metabolism and increased dopamine levels; there are also reports in the literature that this disease is related to estrogen levels; in addition, clinical findings show that vulvar and vaginal Inflammation is a common cause of entrapment syndrome. Itching of the perineum due to inflammatory irritation produces friction, which stimulates the sensitive parts of the external genital organs and causes sexual instinctive activity. The child experiences a sense of pleasure from this, which causes it to recur, resulting in the formation of the leg clenching habit. The main reason for this is the relatively poor hygienic conditions and sitting anywhere in open pants, which leads to pathogenic infection; in addition, obesity. The poor permeability of the vulva and the long-term moist environment are conducive to the growth of pathogenic bacteria, leading to inflammation; a simple lifestyle, usually with more forced bed rest or restricted activities, or playing alone, with less communication is also its cause. Inflammation of the vulva and vagina may be an important factor in childhood entrapment syndrome, so it is important to treat localized vulvar inflammation and strengthen vulvar care. In addition, it is important to change the child’s monotonous lifestyle, give more attention to the child, and reduce the time spent alone. The child should be encouraged and distracted. Prolonged leg clenching can have a negative impact on the child’s psychology and may lead to hypersexual development, so it should be treated actively.