Too many kept too close together, I have this happen every hatch beginning around 1 week + old. The quails get bored and usually pick on eachother. I usually have piles of feathers everytime i empty my drop pan.
About after a week or 2
I use 1/8 inch wire for them as babies but I find if its too cold the huddle up together and get their knees caught in the wire which messes up their joint and then they die because they can walk right.
neosporin for a few days until it starts scabbing and then apply it every other day.I have this issue all the time and thats the regular thing I do with.
Your fine. Chill them means 50 degrees off outside temp for more than 30+ minutes. You should be fine and even then just experience the hatch to take longer.
You'd just have to look around san diego for instance.
Like me I live in Moreno Valley,CA and sell baby quails for extra $$.
But I also have people coming to me from boron and the high desert for some baby quail
Swing by when you want just send me a pm
Its genetics and I have hatches of 100 or 200 at a time theres always small guys that come out and are stunted and i never figure out why but ohh well.
Depending on how high protein the chick starter will be I think they should be fine with the occasional (1-3 days) added protein (Scrambled eggs,Bugs,etc..)