Boy, is this a subject I know a lot about. I've had 3 batches of chicks and in each batch there are at least 3 that need constant butt cleaning for the first 3 weeks. Yes, 3 weeks. It doesn't seem to be a particular breed, either. I've had silkies, Polish Crested, Golden Laced Wyandottes, & Giant Cochins all needing frequent cleanings. They will get over it, although some never seem to be particularly clean in the hind region. All of mine lay just fine. Just a note for down the line, you ALWAYS need to check their vent regions. When they are older with "pasty butt" it could be several important issues-- like mites or lice. Don't let that stuff surprise you, it is quite nasty.