Do they all walk? I find it hard enough getting 2 walkers and 2 non walkers outside!! I can't imagine 5 under 20 months! Thankfully I only have one crawler right now so outside time is a breeze most days. It's actually a break for me as they all free play (the crawler crawls or pushes things to walk) which allows me to sit in my chair and have a break!

I have done the same as busy ece mommy....I got rid of my swingset but it did come in handy when I wanted to "contain" a little one but still occupy them. I have also used an exersaucer outside when I had a really little one. I also have used my green turtle sandbox as a playpen and put toys in there (I never used it for sand lol) In the winter time I used to put the 2 non walkers in the wagon so they weren't on the ground and getting cold.