A little side note and being technical. When taking photographs from this angle, where you are looking up at your subject from lower ground is called "worm's eye view." If you are use to just snapping photos of your kids from a head on or slightly elevated angle, try getting down low. Get on their level or lower and you will get a great view and perspective on how they see things.
Colton showing me, "Up!" He wanted me to see the sky and clouds. He is 15 months old and very curious about his surroundings right now.
Maben was riding on my feet like an airplane. This was the only way I could get him to be "almost" still long enough for me to get a good shot of him.