How big is your coop and run?Also, I should say that the bigger issue is that the girls aren't developing any sense of how to get in and out of the coop. I have to push them out every morning and put them in and shut the door each night.
You don't have a coop page, so I'll ask here for dimensions and pics.
Is it just the newbs that are silkies or are all the birds silkies.
I guess they'd have trouble getting up onto something?