Date	Event	Description
16 July 2009	Amended	Search updated. Four reports added to Studies awaiting classification (Jongkolsiri 2009; Navaneethakrishnan 2007; Sharma 2005; Shravage 2007). The term "spontaneous" was excluded from the title All types of vaginal deliveries are now included in the review (e.g. studies including instrumental birth)
20 September 2008	Amended	Converted to new review format.