week old gosling looks bad, help!

[moenmitz]

One of my week old goslings suddenly is lying on his side, breathing hard, closing his eyes alot. Just started this morning, he was fine last night. When I pick him up, he jumps right up and runs off, he is eating and drinking also, but will lie on his side next to the feeder and lean his head over it to eat. What could be the problem? Any suggestions?

 

[DuckLady]

What are you feeding? Do you have other goslings?
Does he seem bright and alert? Is it possible he is just sitting down to eat because it is more comfortable?
Is he pooping? Does it look normal?