Infants always stirring their legs are considered to be caused by physiological conditions, improper daily care, disease factors and other reasons. 1. Physiological situation: month-old babies grow and develop rapidly, musculoskeletal is in the stage of rapid growth, stirrups is a way for infants to stretch their muscles and bones, if there are no other symptoms parents do not need to worry about, continue to observe can be. 2. improper daily care: if the baby wearing clothes too tight or hold the baby’s posture is not correct to cause discomfort to the baby, there will be a baby always stirrups the legs of the situation, it is recommended that the baby usually wear cotton loose clothing, with the correct posture to hold the baby. 3. Disease factors: If the baby has abdominal distension, abdominal pain, headache and other discomforts will be expressed through the stirrups of the body movements. Babies always stirrup, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.