Infantile leg raising may be caused by physiological factors, calcium deficiency, gastrointestinal discomfort and other factors. 1. Physiological factors: with the increase of age in months, infants may have the phenomenon of lifting their legs up involuntarily at a certain age, usually without other clinical symptoms, and with the development of the body, it can be improved by itself, and there is no need to carry out other treatments. 2. Calcium deficiency: When infants lack calcium, the blood calcium level will be lowered, and they will often have the phenomenon of lifting their legs up, accompanied by restless sleep and other manifestations. 3. Gastrointestinal discomfort: in the daily improper feeding, so that the baby appeared in the intestinal lumen flatulence, intestinal spasm, caused by abdominal distension, abdominal pain and other symptoms, the baby may be through the leg lifting action to relieve the discomfort, and may be accompanied by more than one crying, nausea and vomiting and other symptoms. Parents are advised to take their infants to the doctor as soon as possible to avoid delaying the condition if the infant has leg elevation and other abnormal symptoms.