The first way to remove buttons:

With a small screwdriver hooked the edge of the button and turn slightly right and left until the button is released. So remove the upper and lower parts of the Baby Snap System.

Delete button should be very careful, as this may damage the fabric.

The second way to remove Baby Snap System.

If you need to remove unnecessary button, then use bacares   
Not worth it with the power to pull the crown part of the button, you can damage the fabric.
   Gently straighten teeth buttons and freely remove it.

If necessary, the button can be re-used, especially in cases when there is no available buttons of the desired color or shape. Straighten teeth buttons, small pliers

and the item is ready to re-install