Have the water wings bought because we get these also asked the baby swimming. Was surprised regarding the slipping of the water wings over the many negative comments. We had our little one with six months without any problems therein. Buyer here was our ten months old and had compared to other babies thin arms. Specifically, this means: 14 cm upper arm circumference. Due to the "slip-experience" the other I've tested swim last time if and how easily these things slip. Conclusion: I have eventually stopped to pull the water wings because I was afraid the little pluck his arm; ie: there is slipped garnix! Sure, there are babies with even thinner arms and because that might be different, but hope to have created with the 14 cm circumference times an indication of other interested parties.