Thank you for this thread! I am traveling with my 42 pound 4-year-old and was considering buying a booster since he can legally ride in one now. But I had doubts and wanted to research it. He's big enough for a booster and if used properly I'm sure he'd be fine. But it's a good point about mental readiness. I don't think he is ready to sit properly in it and not unbuckle himself or fall asleep.
3/3/14 at 7:21pm