my 7 mnth baby boy is not eating anything. He wants only breast milk . Worried. What to do?

A. So if your baby has a cold or a sore throat, or if he's teething, he may go off his food. He may simply be too tired to eat. If your baby is well and breastfeeding or drinking formula milk, it could be that he just isn't hungry. Babies' appetites vary from day to day, and from meal to meal.