To make this I used 8 diapers on the top tier, 22 diapers on the second tier, 44 diapers on the third tier and 66 diapers on the bottom-fourth tier.
To make this I rolled a Pampers size 1 diaper from the open waist edge to the crotch edge. Secured it with a rubberband. Once I had 8 done, I placed one in the center and surround it by the other 7. I then secured them all together with another rubberband. This was my first tier.
For the next tiers I followed the above and made another 8 diaper circle then I stuffed additional diapers in between to make another outer layer around the seven. This become my second tier. For the next two tiers I did the same thing just adding another outer layer around each time to increase the layers.
Using a cardboard cake platter found in the cake decorating department I placed the fourth layer on top. Then I placed the third tier on top of the fourth tier added two dowel rods down the layers on opposite sides. This helps keep the layers together. Then I added the second tier on top of the dowel rods and then the top layer. I placed wide ribbon over each layer to hide the rubber band. And then added a big bow with the matching ribbon. I then used thinner ribbon to secure different baby items all around the cake. After it was all completed I wrapped the entire cake in tuille (pic not shown) with a big bow on top to deliver it to the baby shower.
This was a lot of work but the end results were so worth it. I think it turned out fantastic. Hope you like it and are inspired to try one yourself.