Need to prepare: cup, warm water.

1, first of all, in a cup of warm water, water temperature control at about 50 degrees can be, as shown in the figure.

2, and then put the boxed milk into the water cup soak for about five minutes, as shown in the picture.

3, and then put the carton of milk upside down into the cup of water to soak for a few minutes, see the picture below.

4, and finally the boxed milk can be removed, so that the milk is hot, see the picture below.