The 5-Step Booster Test: How to Know When Your Kid’s Ready to Move Beyond a Booster Seat Share this article Print article Has your big kid been fighting you to ditch the booster, but you know they’re just not ready? Let our friend, 10 year old Cooper, tell them all they need to know about the 5 Step Test to determine if they can safely ride without a booster! Note: The vehicle was not in motion during this movie, and yes we know the dog is not restrained. She just wanted to be in on the action of filming the video, and how could we say no to all that fluffiness?!? Does your big kid need a new ride? Check out our seats below!