Some children have the hardest time having their pictures taken. I have met some that just cry as soon as a camera is in front of them. I have also come across children who love to pose for the camera. This can also be a negative if none of their pictures look natural. I have found that the best way to get a child to loosen up during a shoot is to step back. Let them run off and do their “kid thing.” Then when they are in their zone, go and snap your shots.
Here’s some shots I have taken using this approach: