How much breastmilk?


My son is 12 weeks old and goes to daycare from 6 a.m. to 5 p.m. he drinks four 5 ounce bottles (7, 930, 12 & 230). My daycare provider thinks he needs to be bumped up to more milk. He nurses 3-4 additional times at home (5, 8, 1 a.m. & 4 a.m.). I just dont know about bumping him up. He does fine during the weekends exclusively nursing. I dont have an abundance of milk so idk how to bump him to more per feeding while hes there I dont seem to have enough milk for that. What are ya'lls little ones drinking at daycare?