KEY POINTS

The grandmother and the toddler were huddled in the middle of the sidewalk on Gongtibeilu, not far from Beijing's Workers Stadium. As the child squatted, a small stream of urine appeared out of a slit in the back of the child's pants and puddled on the sidewalk while passersby barely gave them a glance. Beaming with pride, the grandmother carefully wiped the tiny bottom, and the two walked off, hand in hand.

The spectacle of babies and children being held over trash cans, squatting in tree boxes, or using the floor of a train as an impromptu toilet is not shocking to anyone who's lived in China for any length of time. And kaidangku, the split pants that allow this anytime/anywhere release, are as much a sign of China as Chairman Mao's portrait looming over Tiananmen Square.