None. Babies don't have the motor skills or the depth perception to change a light bulb.
It was on a strict diet of worms. edit: changed pronoun to avoid ambiguity
One. He just stands there with the lightbulb and the whole world revolves around him.
Two. One to screw it almost all the way in and one to give it a surprising twist at the end.
I don't know but I can look it up for you.
Stopping it with a shovel.
You can't unload sand with pitchforks.
No depth perception.
Because he had no depth perception.
