These articles have info on how to treat it:I also have this chick who has splay leg. Do I need to cull it too?
https://www.backyardchickens.com/articles/treating-splay-leg-in-quail.78692/
https://www.backyardchickens.com/articles/how-we-correct-splayed-legs-on-new-chicks.72873/