The baby sweat more may be environmental factors, lack of nutrients, hyperthyroidism and other causes. 1. Environmental factors: because the baby is relatively young, is in the stage of growth and development, metabolism is vigorous. If the weather is hot, or the baby’s clothing is too much, too thick, will lead to sweating more. 2. Lack of nutrients: If the baby lacks nutrients, especially vitamin D or calcium deficiency, it will easily cause the phenomenon of excessive sweating, which may be accompanied by poor sleep, easy to wake up, easy to be frightened. 3. Hyperthyroidism: the thyroid gland synthesizes and releases too much thyroid hormone, resulting in hypermetabolism and sympathetic excitation, which can cause excessive sweating, accompanied by palpitations, increased eating and bowel movements and weight loss. If the baby sweats a lot and is accompanied by sleeplessness, weight loss, crying and other symptoms, parents should take the baby to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of professional doctors to give targeted treatment.