There's no denying kids are cute.
Part of the fun with set shots like below are the antics parents get up to in trying to keep the child's attention. Some of my favourite shots haven't had the child looking directly at the camera, but at a mother or father's comedic efforts to keep their dearest in frame.
Looking off camera with a sometimes quizzical expression can do more in expressing personality than "look at the camera and smile!".
It should be a fun experience. With digital photography the number of photos taken can be in the hundreds without any financial consequence to the client (unless they want every frame processed!). This often helps to lessen the stress of the parents when bubs decides to push the boundaries.