Hi there.
My little one is 17 weeks and has discovered the delight and frustration of rolling on his tummy (as have I...). When I put him to bed for sleeps he rolls onto his tummy, comando crawls to the top of his cot, gets VERY frustrated and cries (as do I some days). I have tried wrapping his arms, putting a sheet over his belly and tucking it in to try to pin him down but nothing works. I know you can buy thingys which can help, but I'd rather save the cost if there are any suggestions. I'd greatly appreciate any advice.