The water temperature when brewing milk powder should be controlled at around 40-50 degrees. The requirements for water temperature are not exactly the same for different types of milk powder, and the specific water temperature is generally specified in the instructions for milk powder preparation. If the temperature is too low, the milk powder will not dissolve completely, which will make the milk powder taste bad and affect the baby’s desire to eat; if the water temperature is too high, it will easily lead to the destruction of some vitamin-like nutrients in the milk powder and decrease the nutritional value, which will lead to nutrient deficiency in the baby over time. If you have the conditions, you can use a constant temperature milk mixer to brew milk powder, and control the water temperature at 40 degrees or less to facilitate brewing at any time.