Help! We've just bought a Mimsy LX high chair for our daughter. It's all set up, but the instructions say the shoulder straps should be level with or slightly above her shoulders - at 4 months she is already level with the top setting, so she'll have outgrown it within a few months?!. Has anyone else found this? Do you just accept the shoulder straps will have to come up-and-over from below the shoulders?