The temperature of water for newborns is generally around 40 ℃, the temperature is too high will hurt the child’s oral mucosa. Before drinking water can be dropped on the back of the hand to feel the temperature of the water, the back of the hand does not feel hot can be. Breastfed children do not need to drink extra water, because 80-90% of breast milk is water. Formula-fed children need to drink a moderate amount of water between two formula milk, newborn newborns can be fed about 10ml of water, if the child did not vomit can open the milk, between two formula milk, the amount of water is usually 15-20ml. if the weather is particularly hot or the child has a fever, vomiting, diarrhea, need to supplement additional water.