M.M.
Hi D.,
I have a 3 year old and a 2 month old. For those occasions where I've needed a double stroller, I've been using a Joovy stroller where my 3 year old can sit on a bench facing me while my infant is in the front (in his car seat which can be buckled into the stroller). My 3 yr old usually objects to the stroller at first but seems OK once he's situated.
I hope this helps!
M.