Erb's Palsy and Shoulder Dystocia
If you're looking for resources...well I just found a bunch that you could spend several hours wading through and reading.
First here is an image from the page showing positioning during labor that can lead to a brachial plexus injury. Image is from http://www.shoulderdystociainfo.com/whatis.htm
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I'm going to dig around that website a bit more, but the information there looks really solid. So again if you're looking for a place to start your erbs palsy or shoulder dystocia research go check it out.
Also here is a previous post we out out showing a video (medical illustration) of shoulder dystocia.