Baby-daddy follows Ben, a young man in his early 20s alive the life of a mentor in New York City together with his friend, Tucker, and his brother. Their lives are turned upside down if they are home to discover a baby girl left on the doorstep via an ex-girlfriend of Ben's. After much deliberation, Ben decides to improve his close female friend and his protective and at times overbearing mother, Bonnie, and the baby with the support of his pals.