The Babadook - watch online: streaming, buy or rent
Currently you are able to watch "The Babadook" streaming on Netflix, Amazon Prime Video, Icon Film Amazon Channel, Netflix Standard with Ads, Amazon Prime Video with Ads. It is also possible to buy "The Babadook" on Apple TV, Amazon Video, Sky Store, Microsoft Store, Rakuten TV as download or rent it on Apple TV, Amazon Video, Microsoft Store, Rakuten TV, Sky Store online.
You can also stream the title for free on Plex.