2x Hyroler ... Pasty Butt in your chcikcks case probably due to poor nutrition. It needs and should be eating Chick Starter, you could mix with water to make a mush. You could put some ACV w/the Mother in it's water (1T/gal), plain yogurt good too. Keep it's butt clean, wiping/removing poop with warm water. Doesn't look like it's got much feathering so needs to be kept warm, heating pad is a good source, there's a thread on it in this forum MHP by Blooie.