My son turned 6 years old in January. He weights 51.5 lbs. and is 48 inches tall. Is it safe to move him into a booster seat? I have a Britax Frontier in one car and a Graco Nautilus in our other car and I know he can be kept harnessed longer in these seats, but can he safely be moved to the highback booster on these seats?
Thanks!
Thanks!
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