Sweaty hands and feet in infants can be caused by developmental characteristics, improper care, etc. Trace elements such as calcium and zinc deficiency can also cause this condition, in addition to the need to identify the presence of infection and congenital heart disease. I. Physiological reasons: the central nervous system of infants is not well developed, the ability to regulate body temperature is poor, a small temperature difference can cause sweating, especially when the room temperature is too high, cover too thick, too much clothing, while infants sweat gland development is also not perfect, easy to sweat when the activity is large, generally no other discomfort performance. Parents need to take care of the baby, adjust the temperature of the environment, increase or decrease clothing. Second, the pathological factors: 1, trace element deficiency: such as calcium deficiency, mostly due to vitamin D deficiency resulting in impaired calcium absorption, causing sweating, night terrors, occipital baldness, hair thinning, etc., if accompanied by fontanelle enlargement, square skull, softening of the skull, rib exostosis and other symptoms, need to be alert to vitamin D deficiency rickets, should be timely supplementation of vitamin D, more sunshine can promote the synthesis of active vitamin D in the body, thereby promoting calcium absorption, can also be supplemented with calcium. Calcium supplements are also available; 2. Infections: such as tuberculosis infection, especially in infants who have not been vaccinated with BCG, often have symptoms such as night sweats, low fever, wasting, loss of appetite, etc. The diagnosis can be confirmed by tuberculin testing, and anti-tuberculosis treatment can be performed under the guidance of a doctor, with early, combined and full medication; 3. Congenital heart disease: such as tetralogy of Fallot, imperfect heart development appears aortic riding span, ventricular septal defect, etc. The child will have Poor growth, wasting, excessive sweating, blue lips and nails, etc. Heart abnormalities can be found under echocardiography, and the condition will worsen with age, requiring timely surgical treatment.