For all the body horror Watts is asked to portray in this fact - based fiasco, the movie never attempts to truly tap into her actorly gifts (and, no, one final, misguided crying scene doesn't ease the irritation).
The youngest babies can sense
ease versus impatience, delight versus resentment or
irritation, comfort versus restlessness, genuine versus pretending, or other positive versus negative responses in a parent when these reactions aren't evident to a casual observer.