I feel like the baby was a kind of replacement for Ari. I think it was implied Antoine knew and it was kind of like why add more stress on top of the situation. Vianne even says how she and Sophie didn’t mention that time of their lives again because it was too painful. I also felt Vianne was kind of a jerk to her son. She really seemed to think lowly of him. It was a book which had a lot of sad moments and events. Strangely I didn’t really like the relationship with Isabelle and Gaetan. It felt forced and during the moment they really bonded, it got skipped in favor of just having them stumble upon Viannes home