tl;dr The baby was created in a fictional world, therefore he never existed so like the rest of the fictional world it was erased (the pages of the book were blank).

Yet you forget that the Enchanted Forest may be a fairytale but it is still part of the real world, just in another realm - though the world created in 'Heroes and Villains' is fiction (as stated by the author), so anything that was created in the book that wasn't already in the real world was not real, therefore the…