We have 4 2 week old duckling that are drooling, a lot. Here are the details: -We decided to start giving them food twice a day (per Story's book) because we were concerned about them growing too fast. -Today was the first day we took the food away and when we come home from work we gave them back their starter crumbles and mixed in some grower pellets to start the food transition. -After about an hour I went down to check on them and noticed drool and bubbles coming from their beaks. -We immediately put them in a deep sink with warm water, where they are swimming and blowing their nares. -When we massage their crop, a large amount of drool comes out. Any ideas what this may be from? Did they just over eat/gorge themselves on food after being without all day? Thanks so much!