About a week ago I got 2 silkie chicks and a wyandotte chick, I noticed the day after I got them one of the silkies was getting pastybutt. I got it cleaned up and it has been fine for the past couple of days but when I checked this morning it looked like it was getting pastybutt again. The other chicks haven't had any issues. Does anyone know if silkies are just prone to this or could there be something else wrong with this chick? I never had this issue with my other chickens when they were small.