I gave birth a few years ago to a 10.2 lbs baby. Both my partner at the time and myself are smaller people so no one knew where this huge baby came from. I ended up needed a forcep delivery and as a result I had a 4th degree tear which caused fecal incontinence and a large fistula which required repair surgery. I still have occasional gas incontinence but other than that I am healed up.
I saw my OBGYN a few weeks ago and told him we were TTCing. He said he would strongly recommend a planned csection next time, but the option is open to me. He also said I could be induced at 38 weeks and have a vaginal delivery.
I know I have lots of time as I'm not even pregnant yet, but this issue is still on my mind from time to time. The thought of a csection scares me to death as I have heard horror stories of some recoveries.
If you were me, what would you do?

DS#1: born Dec 29, 2013
TTC#2 since Sept 2014 - unexplained secondary IF
BFP #2: 11.7.14 M/C: 11.27.14 @ 6w3days
BFP #3: 04.19.2015 M/C 04.27.15 @ 4w3days
BFP #4: 10.05.2015 C/P @ 3w4days
Oct 11, 2015: Cycle 13. Starting Femara (2.5mg). HSG this cycle (all clear) - BFN
Nov 12, 2015: Cyle 14. Femara 5mg + IUI - BFN
Dec 10, 2015: Cycle 15. Femara 5mg + IUI #2 - BFP #5! C/P 4w4d
Jan 10, 2016: Cycle 16. Femara 5mg + IUI #3 - BFN.
Feb 10, 2016: Cycle 17. No IUI or meds. Taking a break - Natural BFP Mar 5, 2016!!!! EDD Nov 16, 2016
Moving to IVF March 2016
Beta at 10dpo: 21, Beta at 12dpo: 98, Beta at 14dpo: 264, Beta at 16dpo: 745
U/S 6w6d: single beautiful heartbeat of 121bpm - It's a boy!!!!
Nov 3, 2016: Our family became complete. Welcome DS #2.
Re: c-section for a big baby
**DD1 - 7/9/98**
**DS - 11/9/00**
**DD2 - 4/30/13**
My guess is that her doc recommended a cs should she have another large baby coming, not for having a baby is general... Just a guess.
~after 34 cycles we finally got our 2nd little bundle of joy~

My IF blog
When I first got pregnant, I was also warned that a c-section might be my best bet, but I was referred to a specialist at my hospital who is running a study on the long term effects of 3rd and 4th degree tears post-partum before making any decisions. I had a scan of the healed tear (lovely experience, btw! :P ) and after an hour long discussion about my continence after healing/during pregnancy, the scar tissue and the estimated size of this baby (again, measuring well above the 90th) we decided it would be sensible for me to have a planned section on my due date. I have a letter in my pregnancy notes in case I go early, but I went late last time and figure I'll do it again.
I seem to know loads of people who know other people who had big babies and never tore, blah, blah, blah. Well I did and I'm the one who doesn't want to be dealing with continence issues in my 40s. Some pro-vaginal birth people can be very invasive in their questioning of why I would elect to have a c-section, but it's really none of their business and nothing I need to justify to them. I feel satisfied with the thought and investigation that has gone into this decision. I hope this helped; sorry it was a bit long.