They do better on wire floor outside in the fresh air as long as they are old enough. If the other ones were thin or not full when you picked them up its most likely what I think. Some bacteria in there intestine so yuo should treat them for that. For a least 3 to 5 days but don't not give a...
Give them some tetracycline once a month 1/4 teaspoon per gallon of water. The build up bacteria in there intestines which need to be reduced.
Hope this helps. Also raise them on wire for healthier birds