We last went to WDW when my youngest was 8 months. We decided we would wait to return til she was 40" tall so that she wasn't left out of a bunch of rides. She recently turned 3 and is 39" in shoes. Anyone ever use the pediatric growth curves to predict when their child will be a certain height and plan the trip accordingly? I feel like I might be tempting fate. The failproof option is to wait to book until she's 40" tall in bare feet, but who really wants to wait?