Diaper rash on eight-day-old

K
Hello, everyone. My son is only eight days old and he already has a diaper rash. Is that too soon? He also has red spots on his testicles and at some point one of them looked a little bloody. 
I'm a FTM and I'm so scared to hurt him when I wipe him but I also want to make sure I wipe off all the poop. 
I'm using Desitin, though at first I tried the Dr. Brown diaper cream.