Milk is not suitable for children when they have a cold and cough. Milk tends to produce phlegm, and some children have lactose intolerance, which makes them prone to diarrhea. Children with respiratory diseases belong to cold body. Drinking milk will aggravate the degree of cold and dampness in the body, increase cold phlegm and make the immunity appear to be reduced, so it is also not suitable to drink milk during the cold. Milk makes the respiratory phlegm prevail during the cold and aggravates the disease, which will prolong the course of the child’s illness. When a person has a cold, the digestive and absorption functions in the body are relatively weakened, the secretion of digestive enzymes is also reduced, and the activity is also relatively reduced, and the high temperature in the body tends to denature the protein. Milk contains a lot of protein, which is not easily digested and absorbed, so it is better not to drink milk when you have a cold and cough.