Mom at Sixteen is about pregnant 16-year-old Jacey, whose well-meaning mother, after finding out she is pregnant, forces her to keep the birth a secret and both decided to give him on adoption when he is born. But the day the social services worker arrives to take him to his adoptive parents Jacey decides to keep him and she agrees that her mom will raise the baby as her own. A guidance counselor discovers Jacey's secret and tries to get her to enroll in a program for pregnant and parenting teens.