Well, if you willing to keep him as a pet I'd just let him grow with this, by the time he is full grown he may be fully functional just with a little twisty wing and he may even grow out of that. I had a chick hatched out with what looked like a crooked jaw. I thought there was no fixing it...
I'm sorry no ones answered you I hope your baby is well, best you can do is VERY gently bind it to him in the proper place, he's so young it should fuze back together with none or very little deformities. But be careful with the binding you don't want to cut of circulation or have it get...