Four-month-old babies love sweating, may be related to physiological factors, may also be due to vitamin D deficiency rickets and other causes. 1. Physiological factors: four-month-old babies are in the growth and development period, the body’s metabolism is vigorous, there may be the phenomenon of sweating. In addition, the baby’s environment is too hot, clothing and bedding is too thick, etc., may lead to the baby love sweating. 2. Vitamin D deficiency rickets: If parents fail to pay attention to the lack of vitamin D and calcium in four-month-old infants, rickets is likely to be induced, resulting in increased neural excitability, may show symptoms of love of sweating, but also accompanied by occipital baldness, frequent waking up at night and other manifestations. Four-month-old babies love sweating, may also be caused by other reasons, if accompanied by obvious symptoms of discomfort, it is recommended to consult a doctor as soon as possible, after clarifying the cause, to give targeted treatment and conditioning.