Rachel is Pregnant: The major storyline of this season is Rachel's pregnancy. The father is revealed to be Ross after a one-night stand.
Ross and Rachel's Co-Parenting Journey: The season explores Ross and Rachel navigating the unexpected news of their pregnancy and the initial stages of co-parenting, despite not being in a romantic relationship.
Monica and Chandler's Attempts to Have a Baby: Monica and Chandler discover they are having difficulty conceiving and begin to explore alternative options.
Joey's Feelings for Rachel Intensify: Joey's romantic feelings for Rachel resurface and become more pronounced as he supports her through her pregnancy.
Phoebe and Mike's Relationship Deepens: Phoebe and Mike's relationship becomes more serious, with discussions about their future.