I used this from around 5 months old to 12 months old. We had four baby bottles and rotated between them, so I think it wasn't used very often. (The item being sold was stored in a dark place from around 10 months old, for use when going out.) I always soaked and sterilized it in Milton after each use, until I stopped using it. * Nipples are not included. * Although it was sterilized before use, please sterilize or wash it again before use. * This is a used item, so please refrain from purchasing if you are sensitive to this.