I'm pregnant with my third - expected in August.
My first son was younger when my second was born, but no worries about needing a double buggy - he walked everywhere NICELY, didn't get tired.
My second is a different matter though. He doesn't run into roads, but he DOES run. Plus he is still a very "young" boy - he will be three and a half when the next one comes, and right now, I can't picture not putting him in the buggy for things like wet school runs, shopping trips.
Am I best off trying to train him between now and then, or am I going to have to start saving for a double pushchair thing? If parents of runners can advise on what they did please - if you had a calm serene one like DS1, then it is easier to judge and say that it will be fine and he will learn... as I did!