Mom help

I’m sure this has been asked a hundred times, but I’m having a hard time finding a bottle for my little boy...

He will take any bottle really no problem, but he seems to gulp the milk really fast causing a lot of air in his stomach or he gulps it so fast it’s like he forgets to breathe. Not sure if this is a bottle problem or my little one.

We currently use the Playtex Baby bottles with the drop in liners that’s 0+month which seems to work fine, but I’d really like to not spend money on the liners all the time. My little boy will also be 7 weeks on Monday and I don’t know if he should still be drinking out of a 0+ bottle or something with a stronger flow. Any advice would be appreciated.