When I was raising quail I found that any birds that hatched after the initial group were very likely to die. I have left eggs in the incubator as many as 5 days after initial hatch just in case. But every bird that hatched one or two days and rarely into the third day were normally very weak and couldn't compete with the earlier hatchlings. You wouldn't think it but one or two days makes a huge difference and the later birds usually would die. When they are born on time they still have the remainder of their yoke sacs to feed from for the first day or so. When they stay in their eggs to long they absorb the yolk sacs and are born in imediate need of nutrition. They will be to weak already and are unable to compete with the older chicks. If they live thorough the first week they were normally good to go. You are always going to have some die despite your best efforts. If they are crowding under the brooder they are not warm enough. I used to keep my brooder close to the birds so there was a lot of heat and they would decide how close they needed to be to stay warm. As long as there is enough room for them to get away from heat if it is excessive they will be good. I would adjust brooder as needed to prevent piling. For the first week or so I would also place a wash cloth under brooder to help retain heat and prevent any upward drafts. They will shit it up pretty quick. I would discard shitty cloth and replace with a clean one. Hope this help at least a little.
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