J.R.
Oh my goodness, I totally forgot about the embarrassing, post-partum vagina fart. Believe me, it will definitely go away with time and exercise and proper clothing. I found that it happened more in poses with my feet placed higher and while wearing loose fitting underwear.
If you can stand to exercise in tighter fitting, spandex style shorties, or a one piece type of speedo bathing suit, or a support tummy control underwear, it will cut down on the amount of air that slips into you. Then you'll decrease the amount of air being forced out when you switch positions.
This was a great question, as I completely forgot about this odd phenomena.
Happy parenting!!