My 2-week-old chicks are eating starter feed from the local farm supply store and we were told that they don't need grit while eating this. However, I want to start giving them treats and I want to make sure they are able to digest it properly. So far, I have only given them boiled egg yolks crumbled up and yogurt, because I read that they would not require grit to digest these. Is it too soon to give them grit? I don't want to hurt their little tummies. And, if I do start giving them grit, are they old enough to be eating other treats?