Grabbing genitals

My son doesn’t do it but I’ve heard this is super normal for boys. My baby boy just likes to pull the hair on his head so hard he turns the top of his head red lol

My son always grabbed his, and still does to this day. Hes 2 now. It's totally natural. They're just curious to figure out their body. Just like when they first find their mouth and put everything in it, they just want to figure out what it does.