the childlike aspect of a person's psyche, especially when viewed as an independent entity: healing your inner child through psychotherapy.
What Is Literary Apostrophe?Apostrophes in literature were used a lot in the early 1900s and before, but today they’re much less common. Sometimes you’ll still see them in poems, plays, and songs. You’ve definitely heard them in everyday speech.
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British Dictionary definitions for inner child
psychol the part of the psyche believed to retain feelings as they were experienced in childhood
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012