Refuse to drink milk

My baby is currently 1years old so he currently rejected milk . This two days he not feeling well having fever ,So we tot he was teething and cause of not feeling well so rejected milk.But now his fever goes off and he eating solid food well . And because he turn 1 we changed his milk and we thought is he don’t like the milk so we change Back to same brand but he rejected as well Any mummy knows what happen or what’s wrong?#advicepls #pleasehelp #baby