My 7-month old likes to play with my android watch. It's locked so she just futzes with the lock screen. But she doesn't know how to swipe or navigate, she just likes that it's shiny and does something interesting when she touches is.

That said, for me, having only ever used android phones, I always find myself wondering "how do you go back" when I help my mom with her iPhone. No back button! So I guess I'm not as intuitive as a 3 month old on reddit :)