DS is too big for his stage 1 car seat (his shoulders are above the top hole for the straps). The stage 2 seats say they are suitable for age 4 - 6 with minimum weight of 15kg.
DS is only 2.8 but is quite big for his age and weighs 15.9KG (so well above minimum weight). Is it safer for him to continue in the stage 1 seat which he is too big for (according to the guidlines) or move to a stage 2 even though he is too young but above weight requirements?
We're heading on a long journey tomorrow and want him in the safest seat for him!
Can't seem to find any advice online that answers my question.