Mother and child anger/awaken a witch/spirit that tries to steal the child. The creature was shadowy but bulky if I recall, but agile and fast. It was set in an apartment block and I’m sure it tried to tempt the child out of the window. It may have been a local myth in the film, not sure. Cinema release around 2005-2010. May not have been an American/British film but was in English.
Dark Water (2005)?
Nope. Not that one.
Babadook ?
https://m.imdb.com/title/tt2321549/
Neither movie 😩