The montecarlo r1 is specially designed to adapt to each stage of your childs growth suitable for children between 15 36 kg this group 2 3 car seat has an integral adjustment system that allows both the seats height and width to be altered for a perfect fit effectively protecting your child during all stages of growth and accommodating for different thickness of clothing depending on the days weather you can extend its usage even further when used with jans optional xtend impact shie