It is recommended to use water at 40-50°C when warming milk, too high or too low temperature will affect the absorption of nutrients. The specific analysis has the following points: 1. The temperature is too high: breast milk or milk powder contains more heat-resistant nutrients, such as vitamin C, vitamin B, probiotics, etc. When the temperature is too high, it will destroy these nutrients, resulting in nutrient loss, while the baby drinks too hot milk, may damage the gastrointestinal mucosa; 2. The temperature is too low: when the temperature is lower than 40 ℃, brewing milk powder will lead to part of the milk powder can not fully dissolved and deposited at the bottom, leading to the loss of some nutrients. Warm breast milk is too cold, which may lead to indigestion and diarrhea in babies. Before your baby drinks milk, you can measure the temperature with a thermometer against the wall of the cup, or pour some on the back of your hand to feel the temperature of the milk. If the thermometer shows about 40℃ and the back of your hand feels not hot, you can feed it to your baby.