Things to note when choosing a feeding bottle Correctly choosing a feeding bottle is crucial to the growth and development of your baby. Here are a few things to note: 1. Material: Metal, glass, plastic and other materials are suitable, but it is recommended to choose glass or BPA-free (bisphenol A-free) plastic material as the safest. 2. Flow rate: Flow rate refers to the speed at which milk is released when the baby sucks food. Babies at different stages require different flow rates. It is recommended to choose the milk flow rate that your baby needs.