DS2 is about to outgrow his stage 0 seat so needs to go into DS1's stage 1 seat. DS1 is nearly 3 and already it's a bit of a squash getting him into his seat (Maxi Cosi Tobi) especially with his winter coat on! So I'd rather not have to buy another stage 1 seat that will be outgrown in a few months.
The only stage 1 & 2 seat I have seen so far is the Britax Evolva but that's not compatible with Isofix and I'd rather get one that is. Does anyone know if such a thing exists? Or is it safe to put a 3yo straight into a stage 2 seat?