Farrah's mom confronts Simon at Sophia's 7th birthday party after he posts an old mugshot of her on social media. Amber deals with the latest rumor in the media about Matt.
Before Maci, Farrah, Amber and Catelynn return as teenage mothers, the audience is presented with a look at the most significant moments from 16 and Pregnant.
Farrah calls the police on her own mother. Amber faces a pregnancy scare. Maci takes her ex, Ryan, to court for child support. Catelynn is upset that she has to move out of her boyfriend's house and back in with her family.
In part two, Catelynn breaks down over her depression and Tyler and Butch open up about their individual childhoods. Amber and Matt confront Gary over exposing Matt's numerous child support cases.
Maci and Taylor question their decision to have their wedding so soon; Farrah and Simon get relationship advice from Dr. Jenn; Tyler and Nova visit a homesick Catelynn at a treatment facility.
Amber and Gary finally settle their custody dispute over Leah. Farrah plans a move to LA, but questions her relationship with Simon. Catelynn and Tyler debate having another baby.
Farrah introduces her boyfriend to Debra. Catelynn supports her own mom as Tyler's dad goes to court. Bentley has a hard time adjusting to Maci's new house. Amber and Gary continue to struggle with sharing custordy of Leah.
Catelynn and Tyler finally say 'I do'! Maci and Taylor buy an online t-shirt business while Amber and Matt decide to flip houses. Farrah and Debra argue when Farrah lets her know she doesn't trust her to take care of Sophia.