month old chick won’t hold head up. help!

[EmilyChickens]

I’ve got chicks that are about a month old and this morning i found one of them with her head all droopy and she can’t hold it up. she’s still walking, breathing, peeping and responsive. any clues on what i can do?

 

[EmilyChickens]

i’m keeping her head propped up so that she’s not in any uncomfortable position but the second pic shows how she stands without support