Need a booster seat recommendation for large 4y/o who falls asleep in the car.?

Question

His current booster uses the car's shoulder/lap belt, which doesn't hold him up when he falls asleep (as he will on any trip over 45 minutes), as it only tightens when the car slows down quickly. He is 45" tall and weighs 50 lbs.

Answer 1

So the shoulder belt doesn't lock when fully extended? Hmm. Well, any booster seat's going to have that problem. You might have to go back to a harnessed seat.

That said, the Graco Nautilus is a good seat. It harnesses to 65 pounds and can then be converted to a high back booster til 100 pounds. http://www.gracobaby.com/catalog/product...

My tiny, tiny, tiny 8 year old (the size of your four year old) son loves it.