Mine does this sometimes,I find I have to be super careful after a big feed that I don't sit him up too fast etc x
My little girl did this, she was diagnosed with silent reflux, keep him up right for 20 mins after a feed and don’t feed him laid down, try keep him a bit higher so gravity helps bring the food into his stomach and see if it makes a difference! My little girls used to come out her nose! Now we just get the occasional spit up x
Mine does the same and I was told it was reflux but that she’d grow out of it. I EBF too and sometimes if it’s been a while since a feed I’ll express a bit first before she latches so the letdown isn’t as much but it still happens every couple of days so I haven’t quite got it solved