The purple hands and feet of babies may be caused by physiological factors, malnutrition, cardiopulmonary diseases and other factors. 1. physiological factors: for example, the surrounding environment temperature is too low, resulting in poor peripheral circulation, blood flow is reduced, there will be purple hands and feet, cold. In addition, parents to the baby wrapped too tightly, so that the hands and feet pressure, local blood circulation becomes poor, there will also be purple hands and feet symptoms. 2. malnutrition: babies long time partiality picky eating, may cause malnutrition, can lead to the body produce insufficient heat, limbs lack of oxygen, can cause purple hands and feet, may also be accompanied by physical development abnormalities. 3. cardiopulmonary diseases: such as congenital heart disease, respiratory distress syndrome, pulmonary dysplasia, etc., may lead to abnormal blood supply to the heart and gas exchange in the lungs, so that the limbs of the poor blood supply and lack of oxygen, which can lead to purple hands and feet, and in serious cases, can be life-threatening. The baby’s hands and feet purple, there may also 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.