4 months baby sleep sweating, mainly seen in the following cases: 1, the outside temperature is too high, or give the baby too much blanket, thus leading to poor heat dissipation, sweating. This situation to the baby appropriate cooling, drink more water, sweating can soon be relieved.2, rickets, this is due to the parents did not give the baby supplemental vitamin D on time, thus causing vitamin D deficiency rickets, due to the vegetative nerve function hyperactivity, the clinical manifestation of excessive sweating. This situation requires on-time daily supplementation of vitamin D to the baby, if necessary, you can check the blood vitamin D level. If significantly lower than normal, you can also use intramuscular injection of vitamin D treatment. 3, tuberculosis infection, if there is a family history of exposure to tuberculosis should pay attention to tuberculosis infection. Check tuberculin test is positive, sometimes chest X-ray can see tuberculosis infection caused by film, clinical manifestations of low fever, sweating, wasting, need to give standardized anti-tuberculosis treatment.