http://children.webmd.com/nursemaid-elbow
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This boy looks like he's having fun, but really he is shrieking in agony seeing that his arms have just been pulled from their sockets. . .maybe.
We were playing that game with Brooklyn on Saturday when she really started favoring her left arm. I guess her elbow had been partially dislocated and hyper extended. We got it checked on Sunday with X-rays and all, and the doc says that she should start being able to use it again in a few days. She is already doing better, but it breaks our hearts to see her going through pain. So fight back the temptations of swinging the kids until they're at least 3 years old.