When you hold, or play with, or care for, or babysit other people’s kids, you’re always a little paranoid and extra-careful. You don’t know what their parents will do with/to them, so you want to play it safe.
When you get your own kid, though, you slowly realize that you can do anything you want to them! You can kiss them on the lips. You can give them zerberts. You can make them dance like hip-hoppers. You can push their nose up into funny pig faces. You can even put a frog on their head.