Babies thrash, unless they're asleep. Or they're spitting up.
Cats, on the other hand, are in "picture mode" almost every waking hour, and if they slip, they resent you for seeing them :-).
With landscapes, you just have to frame and focus correctly, and have the technology to keep your waterfalls from getting blurry.
Now there's a good pic.
"Hey, the baby is finally sitting still! *Snap, BRAAAAP!* Oh no!"
LOL.
Most cats will pose and act cute for the camera, but I've run across some that were of the mind "take the pic and I will eat you while you sleep".