The Babadook - watch online: stream, buy or rent
Currently you are able to watch "The Babadook" streaming on Shudder, AMC+. It is also possible to buy "The Babadook" on Apple TV, Microsoft Store as download or rent it on Beamafilm, Microsoft Store, AroVision Aotearoa, Apple TV online.
You can also stream the title for free on Beamafilm, Hoopla.