Babies switche at birth are babies who, because of either error or malfeasance, are interchanged with each other at birth or very soon thereafter, leading them being unknowingly raised by parents who are not their biological parents. In real life, the occurrence of such a thing is highly improbable, with it having occurred, or having been asserted to have occurred, in a few cases. However, it is an idea that is a common staple in fiction.