Just to provide some perspective, I have worked on the structural analysis (FEA) of diapers for P&G, when I was working at an engineering consulting firm. As the article states, these companies pour millions into R&D, and for me that included running simulations to determine if the diaper's material properties were appropriate. To do this, I was running simulations of a diaper being wrapped onto a baby, the baby walking, and then pooping. The pressure, forces, stresses on the diaper were calculated and we drew conclusions based on these simulations to improve the quality. When I was working there, I also worked on new razors, loofahs, bottles, etc.