Clarification needed (spoilers here!!)
I really enjoyed this film, even with the few question marks dotted around the story. I really like it when film makers are not afraid of dealing with very difficult subjects head-on, and this one pulled no punches.
However, one thing I didn't understand was: who exactly knew about the child's illness?
The emotional talk between the two sisters after Lea gets the results from her doctor friend implies strongly that no-one but Juliette knew that her son had a terrible illness. However, the social worker/probation officer woman clearly knew, as she asked Juliette why she never said anything. This means that the information was in the documents about the case, meaning that surely it would have been brought up in court - so how did Juliette's parents and sister not know anything about it?
Also, did Juliette's ex-husband, the child's father, know about it? I find it very difficult to believe that she would simply kill the child without telling her husband.
Of course, maybe I missed something (having seen the film after several glasses of wine!) that explains it all...