For this step you will need approximately 14 diapers for a custom theme cake or 20 diapers for a simple/elegant cake, dowel rod, wide ribbon, thin ribbon*,curling ribbon (any color, will be hidden), tape, tape cutting scissors (or other tape cutting device), ribbon cutting scissors and hot glue gun.
*optional
Make sure your dowel or bottle brush is standing straight and is centered. The dowel or bottle brush will give your cake support and keep the tiers attached.
Start building your middle tier from the inside out, as shown:
Keep middle tier centered on top of bottom tier. Fill in your middle tier like you did on the bottom tier.(bottom tier for simple/elegant - bottom tier for custom theme) When second tier is finished, it will look something like this: