Stroller question!!

Peri

Help! I have a 4 year old and I’m due September with baby number 2. I’m debating on wether to get a double stroller or just giving the new baby my sons old stroller since he barely uses it. My concern is my 4 year old occasionally gets tired of walking if we’re at the zoo or going a long distance, but since he’s getting so big so fast is it really necessary to get the double stroller since he’s almost outgrown it anyway ? Thoughts?