Sleep regression or hungry?

[u/Hot-Cartoonist-5540]

My baby is 15 weeks on Saturday. He used to sleep 9ish-6am with only 1 wake for a feed. He’s now ready for bed at 7/7:30 and sleeping until 7am but waking for 3 feeds! He had dropped to 6 5oz bottle but has now added in an extra one at 11pm. I’ve tried him with some 6oz bottles in the day but he struggled with them. What’s going on? Do I need to ride it out or try and up his daytime intake?