Today I noticed that one of my Swedish ducklings(3weeks old) threw up clear liquid. I moved my two ducklings outside two days ago. They have access to a heat lamp, water, and food. They have sand on the ground and eat it from time to time. The girl who is throwing up seems a little lethargic and prefers to sit instead of stand. She isn’t very interested in eating either. Both of my ducks are in a predator proof coop and seem fine otherwise. I’m super worried that she ate something or is sick. Please let me know any tips you have.