It would be plastic backed, with a nice wide landing zone. The tapes would be 2" wide by 3" long. (I'm so tired of short stubby tapes.) I would increase the fluff and decrease the SAP, making a thicker diaper, with a wider crotch. An overnight version would increase the SAP. They would start off plain white, and then add Baby Blue & Pink, followed by other pastels (green, purple, orange), and a Dark Blue and Pink. Black if it's demanded.
Then I would Landing Zone panels printed with things like blocks, dolls, trucks, pacifiers, diapers, etc. that can be taped over the existing landing zone, allowing simple babyish prints without having to keep a million different designs in stock.
Finally, assuming I'm successful, I'd find and commission an AB and/or Babyfur artist to come up with some artwork for even more babyish landing zone panels.