What most parents aren't prepared for is the day the baby decides to evacuate 20 tons of waste from his system every 10 minutes for 24 hours straight. No matter how much you change the kid, his skin is in constant, direct contact with feces and urine. And not in a good way, Japan. On top of that, every time you change him, you're wiping the same area, and no matter how gentle the cloth, no matter how carefully you wipe, it's going to rub the skin raw just from the sheer repetition.
This turns it into an open wound.
The next time the baby starts to cry, you'll get out your poop disposal equipment, remove the diaper and recoil in horror. Blood. Plain as day, there it is. An open, bleeding wound covered in blisters and caked with shit that starts at the genitals and wraps clear to his tailbone. And without any medical training whatsoever, you get the task of figuring out how to treat it without making it worse. And make no mistake, this is your job. It's common enough that they'll laugh you out of a hospital for wasting their time with bullshit like this, and a doctor's appointment is going to end with him prescribing the exact diaper rash cream you already have. The one that doesn't work.