As much shit my son thinks it's ok for him to put in his mouth this dude never had thrash before…

As much shit my son thinks it's ok for him to put in his mouth this dude never had thrash before which I'm so grateful for he also never had diaper rash being that everytime I change his diaper I put cream on him. I see a baby with diaper rash so bad I asked his parents are they just letting him sit in the diaper or is he allergic to the diaper it was so bad