How old do they need to be before i can use pine shavings instead of paper towels? Right now i am having to change the paper towels like every 4-5hrs, and it's getting to be a bit much. I just don't want them to eat the pine shavings. Another thing, I have chick medicated starter feed. I have been putting it in the blender and making even smaller since my chicks were small breed (jpapanese BTW and sebrights). Do you think they are ok to eat the feed without blending? They were born last wednesday.