I just had one with splay leg. I didn't notice till it was a little over a week old. I put the brace on and it had a really hard time with the brace for the first few days. Tripping a lot. But on the fourth day it had it figured out. I took the brace off on the sixth day and the chick is doing great. You can't even tell it previously had any problems
I hope your chick does just as good!
