Why do I believe that birth works? It works because we are created to give birth without intervention or interference. ( I am not referring to the small percentage of women who may need medical assistance). Women’s bodies are designed to give birth and in many cultures girls were nurtured and given special nourishment to safeguard this ability to give birth to the next generation of people. By natural birth I mean a birth that is virtually undisturbed, no interventions such as forceps, vacuum extraction, no drugs, no epidural and no c/section. Natural birth works because it really is safer for the mom and the baby. For more info, check out these sites:
http://www.birthworks.co.za/
http://www3.interscience.wiley.com/journal/118622106/abstract?CRETRY=1&SRETRY=0
http://www.childbirth.org/section/avoid.html