What are the motifs in Little Earthquakes by Jennifer Weiner?

In Little Earthquakes, the four main characters have ample opportunity to forgive and/or seek forgiveness and they all learn the importance of communication.

Lia must learn to forgive herself for her guilt over her baby's death. Her grief is all-consuming and seems never ending until she begins to communicate it to her new friends. Through communicating it, she comes to the realization that she has been consumed with guilt because Caleb's conception was an accident. She hadn't wanted to become pregnant; the timing was all wrong. Then, after he is born, he proves to be a difficult baby, crying all the time and inconsolable, so she never even has a chance to enjoy him. She also learns to forgive her mother, who, it turns out, is not the sinner but the sinned upon. So Lia must ask for her forgiveness as well.