Hi A.,
Ouch! As a parent coach, I can assure you that this behavior is completely normal... which is not to say that you can't refocus his energy. There are a number of reasons why your son is biting, pinching and scratching. In order to stop or change his behavior, you will need to first identify the cause.
*Infants are powerless in our world. We control everything for them and sometimes aggressive behavior is their only opportunity to have power.
*Aggressive behavior usually elicits a strong reaction from adults, which is another way in which they are able to have power.
*Physical behaviors, such as biting, pinching, throwing, hitting, etc, are all ways through which infants explore and understand the world around them.
*Infants also do not have the ability to identify or articulate their frustrations, therefore their strong emotions need to be expressed physically- through crying, hitting, etc.
You need to identify what is causing this behavior. Is it being used as a release of emotions, or is it a way to physically explore the world and take power? Once you've identified the feelings, you can find ways that are safe and healthy for him to express them. Here is an article I wrote that will be helpful to you.
http://www.gilabrown.com/GB/Blog/Entries/2009/7/21_The_Ga...
I am also offering a parent workshop series next month that would be perfect for you. Here is the full class description.
http://www.gilabrown.com/GB/Classes.html
If I can be of any further help, feel free to contact me.
Be well,
G. B., M.A.
Child Development Specialist & Parent Educator
www.GilaBrown.com