What is the best bottle to use?

Brest is best 2.0: ...But if you need a bottle, i like the ones that have a little bag inside that deflates as the baby drinks the contents. Less likely to lead to swallowed air, which is what the gas is in a gassy baby.

Any brand that works: Unfortunately there is no best bottle that i could suggest for your baby. Every baby seems to have a preference as they master the skill of feeding. There are several brands on the market with various claims but if the bottle you are using works well and your baby is nourished, no change is necessary.