1. When you roll up the diapers, use a construct of cardboard to give the cake structure. We cut strips from a pizza box and a cereal box and taped them together to make a circle that we fit the diapers inside.
2. We wrapped a receiving blanket around each diaper layer. Tuck the excess portion of the receiving blanket in between the diaper and the cardboard. This will make it tight and also give it a nice ruching (is that how you spell it?) around the edge. I thought it gave it some nice flair.