Nah, it's second (third, fourth

) babyitis!
To be a bit more technical, no matter whether you had a vaginal birth or a c-section, your pelvic floor muscles are weaker after having a baby (after all, they've had the extra weight of the baby, the placenta, and the amiotic fluid sitting on them for the last few months). I was told that even with appropriate exercises the best you can hope for is 97% of pre-baby tone... so having another baby (and the baby's accessories

) pushing on your pelvic floor again is more stressful sooner.
I've already started waking once a night needing to pee, and I'm not even through the first trimester yet!