Well I was a bit stumped and spent basically all of this past weekend thinking about it. I was online looking at digital stamps for more hours than I care to admit, but I eventually came up with the following card which was inspired by this week's Card Positioning Systems sketch:
I printed the cake twice - once on the "Pink" paper, and once on the "Natural" paper. I left off the cake stand and swirls for the top layer as I knew that there was no way I could cut those out neatly and positioned it on the pink layer that I had already punched out. The onesie was very easy to cut out so I didn't bother with printing it twice, I just adhered it straight onto the pink layer.
Size of card: A5 folded in half
Card/paper - Quill white cardstock, Canson Vivaldi textured paper in "Natural" and "Pink"
Stamp - Squiggle Stamps "Wedding Cake", Onesie in Tainted Sweets "Baby Stamps" set
Extra - Wendy Irving Expressions rubon, Copic Ciao marker in "Pale Pink"
Tools - Fiskars paper trimmer, Helmar glue tape, bone folder (for rubon), Carl circle punch, Cre8tive spring scissors
Thanks for looking!