DS2 was 2.5 when DD2 came along. We bought a double pram (P&T Vibe) and we still use it. We found there are times where he was just too little to walk the distances we were walking or he would get tired and want to sleep. He is now not using the pram as much but we still seat DD2 in the toddler seat, but up on front, JIC DS2 gets tired and wants to go in the pram again.