I have 3 6 wk old silkie chicks, and they still have baby fuzz and a really thin covering of their adult fluff. These are my first silkies, but they are so much less developed than other breeds their age. I was thinking I could remove the heat lamp soon, but I'm wondering if they still need it. Looking at them, it just seems like they have so little protection from the elements. The adult "feathering" they have is beautiful and healthy, and otherwise they are growing, running, eating, and pooping normally. Is this normal, or are mine just slow featherers?