my quails were in the corner on top of each other and those at the bottom all die!its frustrating to see them dead they were 3 weeks old .

[Charlie Wooster]

Hot and humid?.. humidity is moisture in the air, moisture to baby chicks is much cooler than the actual air temperature unless there is a heat source then the moisture heats up just like the heat index/feels like temperature is higher than the actual temperature on a bright sunny hot humid day, they need to be 95° for first week to 10 days then you can drop temp by 5° each week until fully feathered.. that means raise the lamp 2-3 inches a week to decrease temps in bottom of brooder.. they could have been piling up to stay warm most likely, we still need some pictures of the brooder and how you set it up to give a better answer to your question and to solve this problem...