Have been looking at car seats for future sprog.
It seems that that I can buy (1) rear facing then (2) forward facing up to age 4 then (3) booster up till age 11.
But I've seen combination seats that combine either (1) and (2) or (2) and (3).
Since there are many individual (1) (2) and (3) seats then they must be selling. But buying the combination seats would be cheaper.
Is there some "problem" I should be aware of with the combination seats?