Adults are more likely to be lactose intolerant, while babies call it "milk protein allergy". There is a difference between the two. The former is a problem of digestive system, while the latter is a problem of immune system.

Suggestion:

1. Drink a few times. For example, 250 ml of milk is drunk twice.

2. Eat with other foods. You can eat it with porridge, oats, bread, etc. or drink it after dinner.

3. Drink yogurt. If you need to drink 250 ml of milk a day to supplement calcium, you can drink 250 ml of yogurt instead, and you can supplement calcium better. (Lactose has been partially or completely decomposed)

4. Drink low-lactose milk. This kind of milk can generally be bought online and in big supermarkets.