There are many bubbles generated in the brewed formula because of the high content of protein nutrients in the formula, which leads to more foaming. The process of brewing milk powder can also lead to more bubbles if the brewing method is improper, if the milk powder is not stirred in one direction, or if the stirring process is too forceful and produces too much oscillation. If no defoamer is added to the milk powder, the water temperature when brewing milk powder is not well controlled, and the temperature is too high, it will easily lead to bubbles. If the inner wall of the container used to brew the milk powder is not smooth enough, excessive oscillation during the brewing process will also easily produce bubbles.