Milk

I wouldn't think it's terrible. We dealt with a period where mine was only getting water because we were trying to determine if lactose was an allergy or sensitivity when we started switching over to milk from breast milk. I would look at the nutrients that are in his other foods and maybe discuss with pediatrician if it would be enough to supplement what he wouldn't get from milk or if you should do any vitamin though.

Try giving him cheese or yogurt as substitute. If this phase continues then talk to your paediatrician

@Tirtha He loves cheese

My lil likes cheese and yogurt; I really don’t give her milk often.