The water temperature needs to be mastered when brewing milk powder for newborns, if the water temperature is too high or too low, the composition of the nutritional milk powder for newborns is unfavorable, which is not conducive to the growth and development of newborns. When brewing milk powder for newborns, the water temperature should be controlled between 40-50 degrees Celsius is most suitable. First, if the water temperature is below 40 ℃, the water temperature is very cold, thus stimulating the gastrointestinal tract of children, causing abdominal pain, diarrhea and other adverse reactions in newborns; it will also cause inadequate brewing of milk powder, with lumps. Secondly, if the water temperature is too high, it will cause scalding of the newborn’s mouth and will destroy the probiotics and other nutrients in the milk powder, thus causing nutrient loss, so the water temperature is too high or too low is inappropriate.