Formula or breastmilk first, that's where he's still mainly getting his nutrients, I think the food is really to get him used to transitioning to solids.

Its recommended to do it before . Buuuut I do it after . Since I know I'm not feeding him a lot . So I give him whatever puree then give him a bottle or let him nurse .

Its up to you !

Do the bottle and offer food after. He may not eat it but its better he's full on milk first