A few things...
First of all, I thought the film was pretty decent. The acting was pretty stellar (from Mina and Anna, anyway. I'm not a big fan of Adam Driver...), and the concept is very eerie.
I do have a few questions, though.
Spoilers are coming up, just so you're all aware.
1) How was Mina able to get the baby at the end? Her claim of abuse aside, Jude did have medical proof from a professional that his child was incredibly unhealthy under the mother's care and anyone at the hospital or even their friends can testify that her behavior (insisting on seeing the baby right after she gave birth to him, refusing to let him leave the house, giving him laxatives, etc.) was highly erratic and proof of some serious issues on her end. Her only argument is that he beat her. I really don't understand how that works, or why he didn't call social services and go through everything the proper way instead of "kidnapping" the baby. Can someone explain this?
2) Does anyone else think that part of why she became so unhinged and became obsessed with the baby's "purity" was because he was born out of a rape? I mean, there is absolutely no denying that Jude raped Mina. She explicitly said several times "Don't finish in me" and even tried to push him off, but he kept going. Do you think part of her anxiety about being a mother was because of her anxiety about her husband being controlling? She had to go back to Italy and he nipped that in the bud by getting her pregnant. I hate the old trope of rape being the definitive answer to a woman's problems, but I think in this case it was realistically portrayed and could actually make a little sense as to why she was such a mess.