I bought Dr. Brown’s BPA free bottles but when I needed new nipples, I could not find BPA free nipple replacements. The ones that came were level 1 nipples, the holes were too small for my tot so I decided to cut it and make it bigger. Well, guess what? Of course I made the hole too big and now my poor baby is choking on her milk. So I searched everywhere to find BPA free nipples and it makes no sense, but it looks like they do not make them. I also tried out the Green to Grow bottles and when I mixed up the nipples one day, I realized that the nipples are the same size and fits perfectly. In fact, the Green to Grow nipples were better, they are more rigid and my daughter likes it so much better. They are cheaper, to boot! For a pack of 3 Regular Neck Nipples 6+ Months they are only $3.95 at Amazon. You can also find these at Whole Foods or wherever Green to Grow bottles are sold.