I bought four 2-3 week old partridge showgirl silkies. They are cute as can be but very small in size compared to my 2-3 week olds outside in the coop. One died suddenly the other day, and I feel like there may be another on the way out. All of them seem very quiet and lethargic. It's weird I haven't seen them play together at all. They eat and drink, but mostly just sleep. No bloody in the stool. Not sure what to do?