My ducklings are about 2 weeks old. They're on starter crumbles and have been give just a couple of treats. Some finely chopped lettuce a couple of days ago, and today a little bit of plain, unsweetened yogurt. 1. Are treats okay at this age? 2. Should they have grit? If so, how should they get it? Freechoice like their crumbles? 3. How soon can they have a small, shallow "pool" for wallowing in? LOL, and please feel free to answer any questions I didn't think to ask .