It protects against Urinary Tract Infections. Less than one boy in a hundred gets a UTI, and some of those are circumcised. They'll tease him in the locker-room. It's a parental decision. It's his decision.
Parents have to make lots of decisions for their children.
This is the only case where parents decide how much of his body he gets to keep. They wouldn't if they knew what they're missing. You can't avoid birth. Jesus was circumcised. He was also crucified or So was Judas .