Since Danilo Enrique Noreña Benítez risked a definition, take this opportunity to comment on ( back ) the use and creation of such word only can come from someone ignorant enough as to believe that you adding the suffix _fobia to anything can already appoint a pathology; or, I think is more likely to be used only by way of mockery or irony with people who reject children. Fear the 40 children; who can be a disease ) It would be pedofobia, or best paidofobia. See: Paidofobia.
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