Anyone elses’ 8 month old only drinks 2-3 oz at a time?

Irish

My son is at day care in the afternoons for about 5-6 hours and I’m concerned that he does not drink much milk when he’s there. I still breastfeed him and I leave some pumped milk for his day care but he would only have a total of 2-3 oz of milk the whole time he’s there. Then at home he would nurse every 2-3 hours and every 4-5 hours at night. Is that normal?

He weighs 21lbs and he seems active.