Until now, if you wanted a Lifetime tearjerker about birth and babies, you had two choices: a film about a teen who gives birth before she’s ready or one about a willing wife who can’t give birth at all. But now, “Mom at Sixteen” (8 p.m., Lifetime) tackles both in one two-hour helping.

Terry Jeffries (Mercedes Ruehl) is one harried mom. She’s got a newborn baby, a spunky 14-year-old named Macy (Clare Stone) and a sullen 16-year-old named Jacey (Danielle Panabaker). Dad’s not in sight. And to top it off, Terry and her brood have just moved to a new school district.

The new school is located in some kind of suburban Sodom and Gomorrah. The local kids do drugs and have sex all the time. Donna (Jane Krakowski), a perky guidance counselor, fills her class with teenage “rap” sessions. She sits Buddha-like on her desk while the kids talk about teen notions of casual, consequence-free coupling.

Midway through Act 2, we discover that Terry’s newborn is not Terry’s at all, and that she’s raising Jacey’s love bundle as her own to spare her A-student daughter the ruined life of a teen mother.

At the same point in the movie, we learn that Donna and her husband have been trying desperately to conceive and/or adopt a child.

Cautionary tales about teen sexuality always walk that fine line between melodrama and camp. And “Sixteen” often tilts toward the latter

• A 15-year-old named Johnny narrates a “reality” show about working in his family’s wedding chapel in “Las Vegas Garden of Love” (8:30 p.m., Family). Not only do we meet Johnny’s circus-like extended family, we learn that he’s “home schooled.” Yikes!

Tonight’s other highlights

• Five new chapters in the animated series “Star Wars: Clone Wars” (6 p.m., Cartoon Network) unfold over the course of this week.
• Jack uses Dina to bait Marwan on “24” (8 p.m., Fox)
• A teacher gets more than an apple as her reward on “Extreme Makeover” (8 p.m., ABC).
• A skateboarding gamer dude ends up dead on “CSI: Miami” (9 p.m., CBS).
• TV rerun ends in homicide on “Medium” (9 p.m., NBC).