I am not the type of photographer to say "say cheese" or "smile" or "smile big". Especially with children. If a child is a smiler they will smile in front of the camera naturally.
I don't believe in forcing the smiles if they don't want to. Some of the most beautiful shots are those that the child looks natural. That is my theory.
If you like this approach then I might be the photographer for you.
I hope that is the case.