I was about to post the same thing, dd is three in July so only a few months older and she is really tall. Her shoulders are almost at the top of her seat, but she is very skinny so she escapes the harness even with extra strapping that is supposed to keep her in. So for her safety we think she needs to go into a booster as the shoulder straps are wayyyy to low. Glad to here there is someone else in the same situation. Looking at the laws because she isn't safe it's ok to move her even though she is so long.