Expect from horror movies these things: cheap acting, jump scares and some disturbing scenes. This one made near perfection nevertheless.
To be honest if you have mommy issue, watch with your friends and have some settled life of your own beforehand. This movie is both scary horror and psychological terror horror. Weak heart and shaky stomach owners are not recommended to waste two hours to be horrified by its (this movie's) minute details and the entire story. Have some other useful things to do than buying few hours in your life to be traumatized that you just can't undo.