Originally Posted by an_aurora
This would be a good case for extended harnessing. If a child is still leaning out of position, reaching to pick up dropped items, etc, they are too young/immature for a booster.
Then I should put DH in a harness. My 5 year old sits still in the car better.
Said 5 year old is in a high backed booster using the seat belt at 47 lbs and 42".
Just out of curiosity, since he won't grow of this seat for...