Quote Originally Posted by zen39 View Post
For my own children, they were ready when they were 4 years old. They weighed over 40 pounds and both of them were tall, so that their shoulders were higher than the slot for the shoulder straps for the 5 point harness. So it's not so much about age as it is for the physical readiness of the children. If they can stay in the 5 point harness then do so, but for many 4 year olds that is not possible.
I agree. I have an almost 4 year old girl here and she is a big girl (tall and thick.) She is almost to the point where she can't be in the 5 point harness anymore. I will keep her in it for as long as possible here but I know for a fact that she's just in a booster seat in her grandparents vehicle but it is in the back seat.