A disgraced Big Apple teacher’s aide – once entrusted with caring for disabled students – was allegedly busted with a sickening stash of child porn, including thousands of vile videos, photos and files showing infants and toddlers being sexually abused, according to federal prosecutors.

Alejandro Santos, 47, was arraigned Friday in Brooklyn Federal Court on an indictment charging him with possessing and transporting the depraved cache of files on his cellphone, the US Attorney’s Office for the Eastern District of New York said.

Prosecutors said the Bronx resident – who spent 23 years working for the city’s Department of Education – also possessed images of clothed children in classrooms and other settings, some of whom appeared to have physical disabilities. 3

“The details of Alej

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