My little boy had one when he was two - his was from waist to ankle on the broken leg (femar snap!) and to the knee on the other side with a gap for toileting!
He had been in traction for about 10 days before he got the spica cast on, so for the first few days he was just glad to be home and watched films propped up with pillows!
we bought some joggers in a few sizes up, cut them up the sides and sewed Velcro up them. Once he had these on, he got a bit of a slide action going on our wooden floors and he started army crawling around our house! He could lie on his tummy and play Lego and little imaginary games with his figures and cars!
The hospital did give us a specialist car seat, and we had a double buggy we could sit him in to get him out a few times. But to be honest, it was stressful taking him out : he didn’t look comfy, shifting him from car seat to buggy was hard, finding somewhere to change him with hard and I was terrified someone was going to bump his cast! We did two quiet museums I think and a few walks round the park was all we managed.
We arranged a lot of visitors to drop in to break up the days, had family discos where he was the DJ, arts and crafts while lying on his tummy. We liked the brio app, CBeebies app and Lego games section from their website.
You’ll have a few out patient appointments too - I’d be really surprised if they didn’t sort you a car seat, you need to go back and forth from the hospital quite a few times with them. They are quite strict on not recycling the special car seats - we tried to give the one they gave us back to the hospital, but they refused. We ended up having to throw ours in the skip.
we have three young kids, so we were terrified on of his brothers was going to jump on his bad leg! I had to call in some favours so I always had an extra pair of hands, or bring the siblings to the loo with me etc on the odd occasion I was alone with them all! Me and my husband took turns taking the siblings on special 1-1 days out, and our son in the cast spent some time booking tickets etc for special days out once he was feeling better.
it the end, our son got his cast off a couple of days early and started walking again the next day! We made him take it easy for a few weeks but you’d never have known it had happened by the 12 week mark. Kids are so bloody resilient - the team at the hospital told us they had seen loads of kids learn to do a crab walk while in cast!
Have a think about yourself too - it’s really hard work physically. I was exhausted by the end - if you are working, you might need a good bit of time off. It wasn’t the type of childcare I felt I could ask the kid’s grandparents to help with. We weren’t in nursery at the time so I don’t know if they have procedures etc in place?