Nothing has changed.But the thing is; with ‘heavy’ use, the Natursutten nipple will expand.If a size S pacifier has used for too long or too heavily it will expand and be larger than a new size S (but smaller than a new size M)We always recommend using at least two pacifiers at once and alternating them. Leaving them to dry out between uses. And remember that a Natursutten pacifier must be replaced every 6-8 weeks.Natursutten is a completely natural product and does not contain the same levels of stabilising chemicals that conventional pacifiers do, which has the disadvantage that they are less resistant and won’t last forever like conventional pacifiers.There are some pro’s and con’s to everything, and this is one of the things we have to deal with when manufacturing a 100% natural product and have the overall strict rule that making them completely free from potentially harmfull chemicals.