I love these bottles they rock! i have used them with all three of my children the youngest just turned one. They have a handle that attatches , you can use it as a learner sippy cup, iyou can use them with the iris brest pump as well! They come is very handy sizes, three different size nipples, wide opening at top to pour into or put powder into, and the nipple is very different from other nipples, they actual mimick an actual nipple and the baby has to open their mouth wider to drink. the only con i have is if you over tighten or put on the ring crocked it will leak.