This is my almost three year old in a Maxi Cosi Axissfix - it's in grandparents car as when we bought it I hadn't realised that he would have to forward face so soon in it. The head rest will not come up any higher now and I cannot find anything online to tell me how it should be positioned or when it has been outgrown. Does it look too low to you? His eyes are not yet level with the top of the head rest but he does have quite a long head as you can see!