When DD1 was born, we got DS a maxi rider, and moved her into his seat. Then when DD2 was born, we just got another convertible one, but DD1 got the new one, and DD2 got the older one because it actually allows for rearward facing for alot longer. ITMS.

So when this new one comes along, bubs will go into DD1's seat, DD2 will move into DD1's seat, DD1 will move into the maxi rider, and we'll buy a booster for DS cos he will be over 4 years by then.

I think I just confused myself
Erm..... haha. I think I follow you.