It turns out that there are no objective standards for bottle nipples. Their flow rates vary wildly, and their marketing claims can be confusing to the point of being meaningless. That matters because ...

A bottle’s materials, shape, and nipple flow rate are all factors to consider. It’s not uncommon for caregivers to test ...

Ok, we've got tall bottles, short bottles ... So it really helps if you look at the age, or even the flow on the nipple to help you choose which is best for your baby. You'll need to experiment ...