Vomiting duckling

[Poultry parent]

I have a 4 day old duckling, who hadn't fully absorbed its yolk when he hatched. He stayed in the incubator an extra 2 days, and came out when it had been absorbed.

He's not quite as active as the other ducklings, which I assumed was because of the yolk not being fully absorbed.
But I'm not so sure now, because he has vomited 2 times in the last 1/2 hour.
There's no blood in his vomit, or poop. Does anyone know why he threw up?

 

[Kiki]

how is you duck today?

 

[Poultry parent]

He's doing good. I think he just got shaken up a little, or he ate too much

 

[Kiki]

Glad to hear!
Good luck with him!