Changelings

Changelings are the young of faery folk who have replaced the young of humans. It's a very basic definition but I think it covers it. My question was why? Why would you give up your child and take a human child instead. Well some faery tales do have an explanation for this. The answer is in the faery tales where the faeries aren't nice and cute and happy. It is in the ones that paint another picture of faeries. It is said that faeries love having a human servant. If a child is taken they will never remember their families. They wont remember better times or happier moments. It's harder to rebel when as far as you know this is it. I haven't seen any other explanation that makes any sense to me. Most of the stories focus on how the children and parents adapt to the switch.