1. Fresh milk squeezed directly from cows must be sterilized, such as heating it to 100°C and boiling it for a while, and then it can be drunk after sterilization.

2. Open flame heating: When heating on a gas stove, you need to use a high-fire method of rapid cooking, just like stir-frying vegetables, which can lock in the nutrients and prevent them from being lost. Slow cooking will only destroy the vitamins, proteins and other nutrients in the milk.

3. Heating in a microwave oven: The heating time should not be too long. Generally, set the heat to medium-low and heat 250 ml for about 1 minute, otherwise the nutrients will be destroyed. But be aware that the temperature will be uneven when heated in a microwave oven. Remember to stir it before drinking.

4. Heating over water: The best way to warm milk is to heat over water, that is, pour the milk into a container such as a cup, and then put it into hot water to warm it. The water needs to be heated again, and the temperature can be adjusted according to personal taste.