2-year-old baby sleeping sweaty, may be related to the indoor temperature is too high, may also be due to the immaturity of the nervous system development, vitamin D deficiency rickets and other reasons. 1. too high indoor temperature: if the sleeping environment in which the two-year-old baby is located is too high in temperature, or the bedding and clothing worn are too thick, it may lead to excessive sweating while sleeping. 2. immature development of the nervous system: the two-year-old baby’s nervous system is still immature, the body’s metabolic rate is faster, compared to adults, in the same environmental temperature than adults are more afraid of heat, which can be manifested in the phenomenon of sleep sweating. 3. Vitamin D deficiency rickets: two-year-old baby if long-term partiality picky eating, resulting in inadequate dietary intake of nutrients, resulting in the body lack of vitamin D, calcium, is likely to induce rickets, resulting in increased neural excitability, may show the symptoms of excessive sweating in bed. 2-year-old baby sleep sweating, but also for other reasons, if accompanied by obvious symptoms of discomfort, it is recommended to seek medical attention as soon as possible, after clarifying the cause, to give targeted treatment and conditioning.