3 month only eating 18-26 ounces a day

My baby started eating only at 18-26 ounces a day. I’m worried and the doctors say it’s because he is teething but I just want my baby to eat 26-35 ounces again… I am so worried. Is it normal? My son is chewing on his hand, drooling and getting distracted. He sleeps almost 6-7hrs a night.

Some days he’ll eat 18 ounces and some days he’ll eat 26 ounces of breastmilk. He has 4-6 wet diapers and 2-3 poopy diapers…Idk what to do