Infants keep stirring their legs may be physiological phenomenon or nutritional element deficiency, environmental factors, other factors. 1. Physiological phenomenon: infants keep stirring their legs may be exercising their limbs. Some babies exercise their leg muscles by stirring their legs, which is a normal physiological phenomenon and does not require special intervention. 2. Nutritional deficiencies: Calcium deficiency, vitamin D deficiency, etc. can lead to frequent stirring of the legs, accompanied by crying, sweating, cranial softening and so on. 3. Environmental factors: for example, the temperature in the room is too high or wrapped too tightly, too hot, mosquito bites, etc., through the stirrups to express their uncomfortable will. 4. Other factors: for example, headache, leg pain, body pain, stomach pain and other conditions can lead to the child stirring. Infants have been stirring their legs may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or standardized treatment.