I have a nearly 6 year old, a 4 year old who has physical disabilities and a 16 month old who is small for his age (18lb). I'm currently using a double buggy for the youngest 2 but DS2 is rapidly growing out of it and we have an appointment to sort out a wheelchair for him next week. We use buses a lot and mostly walk to school (1.5 miles away). I'm going to need a sling for DS3 but not sure which one. I've got a cotton wrap that I struggle to tie as I'm not that co-ordinated and he is a wriggler. I think I'd like to try a stretchy wrap as they look easier but not sure if DS3 would be too big for it. Also not sure if a non branded stretchy wrap is as good as a moby. I've also got a cheapie stroller that I can put in a bag and hang it off the back of the wheelchair so when I drop DS2 at school/preschool I can put DS3 in the buggy or my nearly 6 year old could push one of them for a little way but realistically I'm going to be carrying DS3 in a sling up to 6 miles a day, eek.