First we had the bran neste size from ABUS Children's Bicycle Helmet and now this successor in size 50-55. What has already bothered us the first, is also at the next size the problem, the helmet does not sit at all. The helmet does not surround the baby's head and the brackets can not solve the problem. We have now bought a helmet from KED, the deeper cut at the back and fixed wonderfully with the locking wheels on the helmet child's head. We do not recommend the purchase of this helmet.