The reasons for the lumps in the milk powder mainly include the low temperature of the brewing water, the amount of water is not enough, and the milk powder is deteriorated, and other factors. 1. Water temperature is too low: If the water temperature is too low, there can be lumps of milk powder. It is recommended that when brewing milk powder, the water temperature should be controlled at about 40 to 50 degrees Celsius. 2. Not enough water: when brewing milk powder, the water is not enough, too much milk powder, milk powder can not be completely dissolved, there can be lumps after brewing, it is recommended to increase the proportion of water. 3. Milk powder deterioration: In the process of milk powder storage, contact with the air occurs, causing milk powder deterioration and moisture. At this point, the milk powder is not recommended for consumption, not only the destruction of the nutrients of the milk powder, consumption may also appear nausea, vomiting, diarrhea and other gastrointestinal symptoms. There may be other reasons for the caking of the milk powder, and you should pay attention to the storage of the milk powder to prevent it from getting damp.