http://www.slate.com/articles/health_and_science/medical_examiner/2012/01/the_truth_about_epidurals.html
I won't paste the whole thing here b/c it's really long, but it goes into studies on whether epidurals lengthen labor, increase the likelihood of a c/s, impede BFing, etc.
DS1 born June 2008 | m/c at 9w March 2011 | DS2 born April 2012