Wry Neck ..also called Crookneck.
separate the chicks ...keep warm as usual..
what temps are you keeping them at?
can be caused by vitamin deficiency
and sometimes from being pecked on the head, especially with certain breeds..
or botulism from wet feed going bad under heat light..(best to check that and clean up any spilled feed)
what bedding are you using?
if from deficiency:
get some Poly-vi-sol liquid baby vitamins, Enfamil brand if possible, no iron..give 2-3 drops on beak once a day, then taper off for another week if chick improves.
in the meantime, get some chick vitamins.
also give a very teeny dab of Vitamin E oil from a capsule.
make up some soft scrambled egg, and feed by hand if necessary.
Kaytee baby bird feed can be used also..(from pet/bird store)
give water by drops on beak as often as possible..
you can also try making up this mixture and feed by hand or if the chick stabilizes some and is able to eat, also have regular chick feed available..
this amount is for 1 day..divided into 3 feeds.
3-4 tablespoons of water cooked oatmeal
I cooked chopped egg yolk
2 tablespoons plain yogurt..
1/2 teaspoon honey or unsweetened applesauce.
add enough chick feed to make it puffy, not soupy or gummy.
give the mixture for 3-5 days..
(if from Botulism..hopefully this mix will help neutralize it..
tho there are flushes you can give.)
post if you need this info...( a crop tube will be needed)
here is a link to more info about Wry Neck/Crookneck, and suggested treatments. and link to video of chick with with wry neck.
http://fowlfacts.proboards.com/index.cgi?board=2008&action=display&thread=429
hope this helps the chicks.