I am aware that I am a bit anal about car seats and my DC so probably keep them in the various categories of car seats for longer than most people would but a friend mentioned that her 2.4 year old was now in a high-back booster using the seatbelt and I was a bit
. He is not a big toddler - fairly average I would say.
This does seem very young to me but my 2.9 year old is still in a Stage 2 (I think - I get very confused with the stages) with a 5-point harness and my 5 year old only just started using a seatbelt about 2 weeks before he turned 5!!