None. Babies don't have the motor skills or the depth perception to change a light bulb.
A: None: Arians aren't afraid of the dark.
Does it have to be a light bulb? 'Cause I had this other idea...
A light bulb weighs about 50g and a single ant can lift about .2g, so it takes somewhere around 250 ants working together.
A: Juan
Because he was Legolas
Because they couldn't find 3 wise men or a virgin.
Because he had no depth perception.