Baby wet hands and feet include physiological and pathological reasons, pathological reasons are hyperthyroidism, rickets caused by calcium deficiency. 1. Physiological reasons: the weather is too hot, the external environment temperature is too high, wear too many clothes will cause the baby sweat more, thus leading to the phenomenon of wet hands and feet. The baby is in the rapid period of physical growth and development, poor body temperature regulation, metabolism will also cause the baby sweating, resulting in wet hands and feet. 2. Pathological reasons: children with excessive secretion of thyroid hormone can appear hyperthyroidism, the role of thyroid hormone in the child’s main manifestations of thinness, sweating, irritability and so on. Rickets children’s body lack of calcium, vitamin D will lead to increased myocardial excitability, often with the symptoms of excessive sweating, thus showing the phenomenon of wet hands and feet. Humidity in the hands and feet of babies may also be related to other causes, when the child appears to be uncomfortable, should immediately go to the hospital.