kekstrom
Chirping
You want to attempt to fix this as early as possible. There is much more flexibility in the first few days. If you use a standards size band-aid the actual bandage portion is the width you want to keep between the two legs. You then wrap the adhesive portion around the legs themselves to create a sort of brace for walking. Separate the chick from any others and make sure it has easy access to food and water. Similar bandage methods can be used on the toes. My splayed legger is one of my healthiest chicks now at 8 weeks (can't even tell). But you have to work on the fix ASAP.
I agree x2. We lost a chick to a slipped tendon, so I can attest to how much harder it becomes to heal injuries/leg & foot issues the longer you wait. Search on here like previous members have mentioned for a wealth of experience. And then if you need to, post in the "emergencies/disease/injuries" section of the forum, with pictures as much as possible and you may get some really helpful day-by-day advice. Good luck! Keep us posted!