Does that expression work?
Does that expression work in American English - to be wet behind the ears at something , meaning to not have still experience at something ?
thank you for advance .

Question

Does that expression work?
Does that expression work in American English - to be wet behind  the ears at something , meaning to not have still experience at something ? 
thank you for advance .

Answer

It sure does!  Generally, in American English, we don't say "wet behind the ears at ___."  You might say, for example: "Oh Steve?  Yeah, he's doing great -- just a little wet behind the ears."

So we generally wouldn't say the "at ___" part.  That would depend on the context and the conversation topic.  It wouldn't be wrong to say the second part, just uncommon.

Ne manquez pas cette occasion d'apprendre une langue depuis chez vous. Découvrez notre sélection de professeurs de langues expérimentés et inscrivez-vous dès maintenant à votre premier cours !