Daycare and bottle feedings

Rachel

So my kid is at daycare from 830-610 every day.

I feed him in the morning around 5 and then at 8 before we leave the house.

I send 3 bottles with 5oz in each.

He gets fed about every 2 1/2- 3 hrs.

This is all breast milk.

Daycare insist that it's not enough milk but I've done the math and it should be enough milk with how much I feed him at home.

Has anyone ran into this problem because I'm not producing enough milk to give him more what I'm pumping