best investment I made when my second was born, was an ergo carrier. THe pram I have does not have toddler seat attaching capabilities, but my first (also a bolter) prefered to walk. I found that keeping the pram for her, and putting bub in the carrier was best for us. On a few occasions it was the other way around (the ergo is good to 18 kg, and at 4 I still use it for her sometimes).

Sometimes my 3 year old sat in the basket behind the seat, baby was in sitting up position in the pram...