A changeling is a child who was put in the place of another child when they were both babies. In stories changelings were often taken or left by fairies.
例句
I have always felt like a changeling born into the wrong family.我一直感覺自己小時候被調包過，不是這一家的人。
英英詞典釋義
Noun
1. a person of subnormal intelligence
2. a child secretly exchanged for another in infancy