I've only just realised that this is possible and think it would be a better solution than the straps I currently have as they pull DS back against the backrest, meaning he can't look out and around. I can just unhook the straps from his arms but this doesn't feel very safe. A friend had a buggy with straps which came up from the bottom and allowed her DS to lean forwards, and I liked that better.
So my question, can anyone recommend a harness which can be attached to D-rings on a pushchair? Also, I don't know if this is possible, can you get one which attaches between the legs as well? If he fell asleep I think he might slip out forwards without a strap between the legs.