If they discovered the changeling quickly enough , they could get their human child back . One way to get the child back was to put the changeling in an oven . Putting a changeling in a fire would cause it to jump up the chimney and return the human child , but at least one tale recounts a mother with a changeling finding that a fairy woman came to her home with the human child , saying the other fairies had done the exchange , and she wanted her own baby .