During all the excitement with new baby, little (now quite big) Henry, hurt his elbow. I could tell it really hurt bad because He would cry any time we moved him. He would not lift his arm or use it for anything. I immediately remembered the one thing Kate reminds me of at least once a month when she says, "Remember when daddy pulled my arm." This was an event that occurred when she was about 2 1/2 years old. We were playing and she got hurt. It turns out the problem was nursemaid's elbow.
With Kate, we had xrays and a visit to the "specialist" (translate into 2 copays). This time, I turned to Google.
This website gives an excellent walk-through for fixing this problem. I tried it on Henry, and 2 seconds later, he was fine.