They say that knowledge is power, and when it comes to childbirth there are many things to know. But what is better when it comes to the final stages of labour? Is an episiotomy better for women, or a natural tear? Is there even time to decide? David Addenbrooke is an obstetrician and co-author of 9 months, The Essential Australian Guide to Pregnancy. He takes us through when an episiotomy is necessary and why natural tears aren't always something to be afraid of.