My 8 week old has been drinking 5oz consistently for the pas 3 weeks or so with little to no spit up afterwards. Now he cant do 3oz without spit ups. Anybody else's kiddo doing this or is it something to be concerned about?

I should note that we have one of those baby keurig that makes a bottle for you, and its amazing cuz it doesnt put any bubbles in the bottle, smooth as silk. This week was his first week with daycare and they dont use one so maybe the air bubbles are upsetting him now? It seemed to start about that time.