I’m not a medical Dr, I do know it’s normal for young male infants to have erections. I’m wondering if there’s still some pain in the area & that’s why he doesn’t like his penis being touched. I suppose there’s also the possibility of some nerve damage in the area, not sure if that could have an effect. I think it would be perfectly appropriate to ask the Pediatrician about this - just state what you said here, the difference you noticed between the older boy & this one. Dr. would most likely want to examine him. Also hoping maybe an MD w/ knowledge in this area could provide some advice here on MedHelp. Good luck & let us know what found…