From Longman Dictionary of Contemporary Englishchangelingchange‧ling /ˈtʃeɪndʒlɪŋ/ noun [countable] literaryRF a baby that is believed to have been secretly exchanged for another baby by fairies
Examples from the Corpus
changeling• He was the changeling of the classic tale, thrust on good people, who was to repay good with evil. 