
Bending down to adjust a stroller strap or to talk to your child is, it seems, a grave hazard, if one is given to wearing anything other than the highest-waisted pants known to man or womankind. Even carrying your child - inasmuch as it creates a downward drag on clothing, and also precludes effective clothing-adjustment (what with one's hands fully occupied and all) - can pose derriere-exposure problems.
So it is that NO PARENT - no matter how rich and glittery and styled-to-the-max - can escape the dreaded Mommer's (or Dadder's) Butt. Behold, the crack:

(Seal)

(Brooke Shields)

(Sadie Frost)
High-waisted jeans available at your local JC Penny. Consider yourself informed.
Source