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Learn now to be safe around dogs. Contact your local DogSmith for information on dog safety.
http://www.doggonesafe.com/Signs_of_Anxiety
These signs indicate that your dog is uncomfortable with the current situation and there is a need for intervention to prevent pushing the dog to the point of biting, and to make sure your canine friend is happy and not feeling anxious.
Please remember: It is a GOOD THING that a dog shows you that he is anxious or uncomfortable, rather than going straight to a bite. Never punish a dog for showing that he wants to be left alone by growling, leaving the situation or demonstrating more subtle signs. If you punish a dog for growling or breaking a stay to get way from a child you might suppress the warning or avoidance behavior and he might just bite without warning first the next time. The dog still feels exactly the same way about the child bothering him, but now he has no way to show it and no way out of the situation. Be glad if your dog gives a warning and take steps to modify the behavior of the child, condition the dog to enjoy the child and create safe spaces for both dog and child.