I had never heard of this in my life. It's called Elimination Communication (EC) is a practice employed by parents to read babies' signals rather than to rely on diapers.
This seems nuts to me, but then again, what do I know. This is why I'm sharing the story to get your opinion.
These parents let there kids pee in the sink. Alot of the parents say their babies are more at ease and comfortable with this method. See what you think!