Something I was reading the other day pointed this out, I thought it was rather interesting.
We're told to be careful how we treat infants because we don't want to set up bad habits. For example:
Don't sleep with your child - you'll never get her out of your bed.
Don't respond to every little noise - he needs to learn to self soothe.
Don't always carry her around - you don't want her to get used to it.
and so on.
We never hear anyone say:
Don't let your baby pee in his diaper, you'll never get him potty trained.
In fact, we EXPECT babies to eliminate where ever and when ever in their diapers for two years (or more!!!) and then learn how to use a toilet when they're developmentally ready. Too bad that attitude can't be transfered over to some of the other situations.....
(and some would argue that's it's completely backwards and it's the diapers that aren't necessary and cause problems...)