Topic Research: Changelings

I would like to tell a story of the fairy parents and their reasoning behind switching the babies. From my research, some possible reasons that fairies did this were because they wanted that human child to act as a servant, or this was an act of punishment to the human parents. In the scandinavian tales of trolls, they would switch babies so their own would have a good life. I would like to play on the fact that the parents wanted their own to have a better life. Maybe there was a food blight and they couldn't provide for a growing baby. Once they switched the babies, I want to write about how they even may have seen the human baby as their own. 

The next story I would like to tell is the human baby realizing it wasn't a fairy. In my research, the human child usually stays with the fairy families. I think there would be a internal struggle if the human baby would go back or stay with the fairy family. 

The last story I would like to tell is the changeling baby and the parents. In my research some families would turn away the changelings as soon as they learnt it wasn't theirs. This kind of makes the fairy parents work go to waste. I want to do a story of the changingling being turned away, but also being old enough to take care of itself. Maybe eventually the changeling and the fairies reunite. 

My source that I used was: https://en.wikipedia.org/wiki/Changeling

(A fairy baby from Tom Halvereson)