It is thought that leaving the cord unclamped, free to drain, on the mother’s side reduces the pressure at the site where the placenta attaches to womb. This makes the womb contracting to remove the placenta after the birth of the baby more efficient.
Reduce the length of time for the placenta to detach and deliver
Encourage the placenta to detach more completely
Reduce the amount of blood lost during this stage
It is important to remember that any blood draining from the cord is not the mother’s; it has come from the placenta and would have been discarded regardless. It might be preferable to use a container for the cord to drain into, just to minimise the mess.
Currently the standard practice after the baby is born is to clamp both sides of the cord and cut between. The mother’s end is then left clamped whilst everyone awaits the placenta. A Cochrane Review in 2009 (one of the highest levels of research that compares other research papers to draw conclusions,) looking at leaving the mother’s end free to drain, found there were not enough studies to make any definite conclusions as to the benefits, however there were no apparent disadvantages and the time taken for the placenta to deliver was shortened.
Soltani, H., Dickinson, F., & Symonds, I. (2009). Placental cord drainage after spontaneous vaginal delivery as part of the management of the third stage of labour (review). The Cochrane Database of Systematic Reviews (4) . John Wiley & Sons Ltd.
Written for Cornwall Birth Circle: http://www.facebook.com/cornwallbirthcircle