What would happen to a child who is in a car driven by an unlicensed driver and they get pulled over?

Likely it would depend on the circumstances surrounding why the person did not have a license as well as whether the child was properly in the car, i.e. car seat if applicable. Certainly if the suspension is serious (and most are) and especially if the child was determined to be in danger in any way, CPS is not out of the question.