Do you think it has more to do with the formula? Or the bottle?
Forgive the dumb questions, we're just transitioning from BF to FF.
We're currently using playtex drop ins (Per the lactation consultant's advice - but since we're not BF anymore, I am open to change), and similac sensitive...

Re: If your formula baby rarely spits up...
formula or baby. We have 3 different types of bottles and he doesn't spit up with any of them
We use mainly Playtex drop ins and Avent bottles. If we're in a jam... the Medela one that connect to my pump have worked well too.
My Etsy Store PIGGY'S PLACE




i think it has more to do with the baby and his / her tolerance of the formula.
fwiw, we are using avent bottles and enfamil lipil formula.?