When shaking my MacBook I hear a strange sound, like a wobble I recently bought a MacBook Pro (Retina, 13-inch, Early 2015). 

When I shake it vertically, some slow sounds come from it and it sounds like something wobbles in it.

Is this normal?
Your Macbook Pro should not be making any noise when you shake it, but there are a few things it could be: either the screen is moving ever so slightly or the internal fan is just moving when you shake it. If it is neither of those things (which the fan thing is unlikely so you have to decipher wether or not is it the screen) I would take it into an Apple store. It is most likely a minor issue like a loose screw or the like but if it is under warranty and there is an Apple store near by there is no harm.