Well it happened...at 15 months. My baby apparently broke his arm last week..in 2 places and didn’t ever really act like he was in pain at all. We went to the doc last week and they said just to watch it and that he could have just hit it pretty hard..we watched it for a few days and took him back in today and found out it was broke. The docs couldn’t believe it because he was still using the arm to do a lot of things. He did favor it more than normal which is how we knew it was bothering him. The only thing that happened that we could think of is he fell kinda hard in the driveway. My poor baby is so tough...it doesn’t even seem to be bothering him to wear it. Thankfully he only has to have it for 3 weeks