I bought these thinking they were best for newborn but ds seemed fine on the ones that came with bottles. I have never used them although they have been sterilised once. It seems a shame and waste to throw them away. There are 8 altogether still in the original boxes. They are a bit expensive to buy if you are not sure they are going to be right for your baby. If anybody would like them them let me know and I will pop them in the post.