I have 5 ducklings; a rouen, indian runner, and 3 muscovies. My breeder told me that he starts feeding them layer ration at about 1 month old, so since they're all just over a month old, I mixed in a little bit of layer ration with their regular feed (chicken scratch and duck grower). This morning they all have plump, bloated bellies and are hiding in their house (this is unlike them). What can I do about this? I took the feed away,and let them swim in the pond for a while. They were all very active when I took them out of the pen. I fed them a little watermelon as well, and they ate it right up. Should I be concerned? What can I do to help them?