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Yes, the yogurt will probably help a lot. Chicks need to be heated so they can digest their food properly. Since they didn't get enough heat, it probably slowed down their digestion, and in turn, built up bacteria that would otherwise pass through. Since they are young and their immune systems are immature, it was probably just enough to throw them off and give them pasty butt. Don't feel bad, we all have made mistakes when we were just starting out too, and pasty butt is really quite common especially when chicks are shipped. As everyone else said, you can wash off the poop with a warm water bath.