the nurse is observing a 3-year-old boy who is sitting and playing in the waiting area of his pediatrician's office. the nurse calls the boy and his mother back for the boy's appointment. the boy rolls onto his stomach and pushes himself to his knees. then he presses his hands against his ankles, knees, and thighs, walking up the front of his body, to stand. which condition should the nurse suspect in this client?
