Not all women want to be mothers, and this movie ALMOST recognizes this.
Jenna had no desire to be a mother. This is made abundantly clear throughout the movie. Given her situation, it's hard to see how she could WANT to be a mother. Her husband is a controlling A-hole, she has no money, no support system (we never learn of any family or close friends). It's an incredibly *beep* situation to bring a baby into.
It was refreshing to me to see a film where the main character wasn't falling all over herself at the thought of becoming a mother. Jenna felt absolutely no joy or excitement about being pregnant, and at one point even says she feels no maternal love towards her baby.
Crazy as it may seem to some people, not all women want to be mothers, and not all women see a pregnancy as a blessing. For them, it's a disaster, something they wish hadn't happened, something that's going to ruin their lives. I thought for once there was a movie that made the statement MOTHERHOOD ISN'T FOR EVERYONE.
But then of course in the final 10 minutes Jenna delivers her baby and as soon as she holds the baby in her arms, she does a total flip-flop and suddenly motherhood is the best thing that has ever happened to her.
The same thing happens in Knocked Up, released the same year: For 90% of the movie the characters aren't happy about having a baby, but once the baby comes out, everything magically changes.
Don't get me wrong: I love Waitress, it's one of my favourite movies, and Adrienne Shelly's untimely passing was a huge loss for the movie world.
The ending has always bugged me though. I feel it sends the message to women that if you aren't happy about having a baby, there is something wrong with you.