I bought this about a year and a half ago when I was having trouble breastfeeding my older child. Thanks to it, their sucking strength improved, and they were able to breastfeed directly. My second child, who was born the other day, breastfed directly from the start, so I don't need it anymore and am putting it up for sale. I sterilized it in the microwave before storing it, but please wash and sterilize it again before use. I threw away the nipples because they were worn out. I'm selling the two bottles, the rim lids, and the caps shown in the photos as a set.