C.P.
Hi R.!
My 14 month old is a head banger. He bangs his head when he is tired, frustrated or when he seems to be understimulated.
It is scary, but the more I have read about it, the less afraid I have become. Here is a really great link to an article about it: http://www.drgreene.org/body.cfm?xyzpdqabc=0&id=21&am...
So according to the article, it is normal and very common among boys.
The way we have started to cope with it is that we tend to not make a big deal about it and he has been doing it less. I am thankful to read that they grow out of it...hope this is helpful!