Glad to hear everything is normal!
I wanted to address the evolution argument. Yes, I believe that the human male has adapted with the optimally designed penis structure, but diapers are a relatively new thing. Before there were diapers, babies didn't have the problem of poop getting inside the foreskin because they practiced some kind of elimination communication. Poop didn't stew around in a cloth against the penis. I am practicing EC with my new babe (2 months, just started a week ago), and it has the wonderful side effect of not worrying about poop inside the preputial orifice. And it has allowed the little case of red rashiness on the tip to clear on its own.