a quote from here:
http://www.raising-chickens.org/hatching-chicks.html
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Question
Hatching chicks: I have Orpington chickens. Out of 24 eggs I have 2 chicks that lay on their sides and can't right themselves, just hours old now.
Will they get better or should I put them down? What causes this? One of them I can right it and it does OK for a while then goes on its side again till I right it again. Thank-You I have read all my books and none of them address this problem.
Answer
Hatching chicks: I would give them at least 24 hours and see if they can right themselves. As you can imagine, their last week, crammed inside the shell, is a tight fit.
Generally, during the hatching process, all muscles get exercised and pushed to their limits; connecting, coordinating, muscle and nerve messages with the brain. A chick can be exhausted once out of the shell.
A little physical therapy might help…getting them up on their feet, helping them to bear their weight on both feet equally.
If they are unable to act normally after their first day, there may have been some incubation issues that caused them to fail to develop normally. In that case, I believe, it would be inhumane to keep them alive."
there are other Q's there about the same thing.