Loss of appetite?

Catherine

Little one is 13 weeks old today. Over the last two weeks he went from having 5oz to 7oz at every feed, draining the bottle completely. Since last night he’s been drinking exactly 4oz at every single feed and then he pushes the bottle away or falls to sleep, even after being winded. His sleeping pattern hasn’t changed and he’s still going 3 hours between feeds, according to wonder weeks he just finished his 3rd leap (if that makes any difference). Just wondering if anyone else is experiencing this right now?

He’s absolutely fine in himself, the only thing I’ve noticed is that his hands are constantly in his mouth even though he’s not hungry, so maybe first signs of teething?