This summer I will have my 3rd baby
. I'll have a 6 and 3.5 year old already by then with a 1.5 hour walk preschool/school run. I'd really rather avoid driving it to keep fit and get some fresh air but my preschooler isn't a strong enough walker to manage it.
The side by side ones such as baby jogger won't fit through my front door annoyingly so I'd be looking at a Phil and Ted's style. Perhaps the Dot?? I'd like it to be as light as possible as my eldest is heavy and we live on a hill 
Is 3.5 too old /big for a double buggy??
I think I'll just need something for the first 6 months or so, so would hope to get second hand.
Can anyone offer me their wisdom please?!?
I should add, I will wear baby in a sling a lot (I do love it!) but I struggled with my second who was in the sling constantly and wanted my own space to breath a bit especially on very long sleepy walks TBH so I think I'd like to be able to put them both in a pram on times like these when rushing from preschool to school for pick ups. I also find it easier and better for my older children to be able to play with them at the park etc without the baby always in the sling so it's nice to have the option to tuck them up sleeping when we have the opportunity!