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mine moves on my 5. didn't on my 4s.

Personally... and I say this with much experience returning/exchanging for petty stuff.... just keep it. It's NORMAL. If it gets worse in the next YEAR, send it back/get it exchanged. Otherwise, it's normal.
 
To be honest I wouldn't doubt it. My iphone 5 had that problem and even Apple said it was shot. All my friends were like "oh no it's not bad" and at Apple they said it wasn't right and replaced my phone.
 
The slightest graze of the button with my finger causes it to move...I didn't have the iPhone 5, is this normal or is there something wrong?

sorry, I meant to say if you really push for getting it replaced they will.
 
Buttons on the iPhone 5 are in a housing that provides a little wiggle room. It's common on many of them. I wouldn't return the phone because of that.
 
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