Yes, Amy and Jonah did have a baby. In the ending montage of the series, it is revealed that they had a son named Carter.
Their Future Together
After Amy's return in the "Perfect Store" episode, where she attempted to save the Cloud 9 store before ultimately resigning from her corporate role, the show's finale offered a look into her and Jonah's future. The concluding montage revealed that the couple not only got married but also began a family, welcoming their son, Carter. This happy development occurred alongside Amy securing another executive job, marking a complete and fulfilling resolution for their relationship and personal lives.
