...if you're gonna use it as a belt-positioning booster for your 3 year old?!?! I was excited to see that one of the kids in Jaylee's preschool had a Mariposa Nautilus in her car (most are in no back or high back boosters), but when I was sneaking a peek I see her put the girl in it and put the shoulder belt over her!! Ugh, WHY would you bother if you're not gonna use the harness to the full potential? Or at least 4 and 40 which is Missouri law, but apparently no one in my community has to follow that particular law?!?!