Is it the nipple or the bottle?

radiokate

What causes more gas issues? I have Medela nipples (from when I was BF and pumping) but when I switched to FF, I just put those nipples on some really cheap bottles (those .96 cent ones from Walmart), thinking that I would have to get "nicer" bottles eventually... (You know, after the BF meltdown at 2am... Well sure enough, they've been working out just fine, no issues...

But now she needs to go up to a bigger size in bottles (and I think a faster nipple flow). Do you think since the bottles work fine, that I can just use the nipples they come with? Or should I buy more Medela nipples, because the bottle doesn't really matter, the nipple is more important? (I suppose I could just try both, and see what happens, but I would rather save some money without experimenting, and I thought maybe there was some rule of thumb that the bottle or nipple was the more important element?!) TIA!