The second one is it!! The first one was about a woman who had a phd and was using a special diaper ever time she wet it she would loss more of her memory/iq
Looking for two stories.
One where a girl losses a bit of her memory every time she uses a diaper.
the other is a story about a girl gets signed up for a national contest held by pampers (I think)by her sister and she wins and goes to a summer camp.