I have had two natural deliveries of large babies (10lb4 and 11lb1) and am tall but small built. Both times the midwife (CNM in hospital) did a catheter (just insert and remove) as I began the pushing stage. She said she doesn't like to do the intervention but wanted as much room for the birth as possible. I really don't wait it this time (due in Nov) but is it really something that could make a difference?? I would love to hear opinions.