Not all baby bottles are created equal. Like most parents, we want our milk bottles to be safe and non-toxic (e.g. BPA-free, BPS-free, no estrogenic activity etc), but that is not sufficient. We also want a milk bottle that is practical for frequent daily use. This is where the material of your baby’s bottle plays an important part. There are 2 main categories of milk bottles - Glass & Plastic. http://www.china-yongkang.com/milk-bottle/