First of all before the start I would highly recommend you to clean you hands. I believe its important to practice hygiene.
So, my cake has 4 layers. The first and the second layers I was doing with the help of pot. While doing first layer I let the center empty and then fulfill it with another roll of diapers. here some pics to understand.
Now cake is ready to decorate it. As I said before I used corrugated paper and wrapped cake.
And my favorite part is a cake decoration. I bought a lot of thing to put inside. It is baby socks, shampoo, baby cotton sticks, cotton hat, flat backs to decorate edges and many other things that will be useful for the baby and can safe parents' budget. Please feel free to add other interesting baby products.
I hope it was interesting post for you, please if you still have questions, don't hesitate to ask me or visit my web site where you can find better tutorial explanation. http://crazyhands.net/diaper-cake/
See you soon!