Help!!! My Baby duck Keeps throwing up!!!

[AlexisElizabeth]

I bought 2 ducklings earlier this week, its my first time raising them and I'm worried about one of them.
He keeps throwing up his food, is this natural, if not what do I need to do??
Help me please.. I don't want to loose him...

 

[llaaadyel]

What are you feeding them? They should not be on medicated feed. What kind of housing, anything in the water? Anything else unusual happen in the last day?

 

[AlexisElizabeth]

I have been giving them the medicated feed because that's what the guy I bought them from said I should be, their in a cage with a heat lamp above them and news paper as bedding...
Why shouldent I be giving them the feed... Will it hurt them?