A changeling is a child who is suspected to not be a couple’s real child. As the myth goes, a changeling was substituted by fairies.
Do you ever feel like your parents might not be your real parents? Then maybe you’re a changeling. A changeling is part of a switcheroo by fairies who switch out a couple’s real baby with another baby. The new baby is the changeling. Fortunately, fairies are mythical creatures, so the concept of a changeling is also fanciful. The -ling part appears in many other Middle and Old English words: underling, hireling, duckling, and yearling, to name a few.