When Sam tells Ben that she may quit her job as bar manager because of her long commute, he comes up with a solution to keep her close to work, which involves Danny vacating his room. However, Ben's master plan doesn't work out too well when Sam brings home her boyfriend. And when Bonnie recruits Tucker as an assistant for her new job, she finds herself actually working for Tucker.

Baby Daddy follows Ben, a young man in his early 20s living the life of a bachelor in New York City with his buddy, Tucker, and his brother, Danny. Their lives are turned upside down when they come home one day to find a baby girl left on the doorstep by an ex-girlfriend of Ben's. After much deliberation, Ben decides to raise the baby with the help of his friends and his protective and sometimes over-bearing mother, Bonnie, and his close female friend, Riley.