I purchased from Wilco farm store a newly hatched chick baby 2 days ago. It has pasty butt (which has been mostly cleaned...vent is open) and a very enlarged chest. It seems the "older" of the 5 hatchlings purchased. It is a Delaware. Also the Light Brahama I purchased at the same time, died without symptom today, so I do not want to loose another chickie...the temp in the brooder is stable 95 tested on multiple thermometers and cooler at the end with the water and feed.