Right as I see so many threads where you guys mention tearing... can I share with you some info which might help?
First of all a major (thousands of women) study has proved that if you do perineal massage (if it is your 1st vaginal delivery) you reduce your risk of tearing ! The stats are not as impressive with 2nd birth BUT there are less tears in 2nd births generally anyway (I know many women who did not tear for their 2nd baby whilst they did for their 1st - usually because the 2nd stage is better).
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You do tear MORE if you are lying down (in bed with monitoring and drugs pumping : the synto drip or the epidural)!
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Risks of 3rd and 4th degree tear are higher in women who are given an episiotomy. There is a simple "desk" test you can do... take a piece of paper (or cloth for that matter)... wiggle it violently in the aim to break it... it probably won't break (unless you are very brutal) ... now cut it a bit and wiggle it again.. it will tear! It's basic ! Meaning women given episios often tear as well!
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Coached pushing increases the risk of tears
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Women who listen to their body (and I sometimes have to remind them of this or at least the MW should!) will birth GENTLY and not tear!
More info here and here