Chelsea learns a friend of hers is pregnant, while Leah is horrified to learn that Aliannah may have a genetic disorder. Kieffer and Jenelle have a court date set for them and Kailyn becomes annoyed with the men in her life.

Kieffer is upset that Jenelle hung out with an old boyfriend. Leah is relieved that Ali has no major genetic disorder. Adam slips back into his old ways, much to the dismay of Chelsea. Kailyn considers filing for child support.

Jenelle moves in with her best friend Tori after fighting with Barbara, and Kieffer reenters the picture. Chelsea's relationship with Adam is going downhill fast. Ali may still have a genetic problem. Jo confronts Kailyn about filing for child support and they get into a big argument about who is the more responsible parent.

Jenelle decides to go to rehab. Chelsea finds a GED class at a local college, goes in for a consultation, and takes her first practice test. Leah files for divorce in order to protect her custody rights. Jo visits Issac during the week and Kailyn hooks up with Jo, even though she's still with Jordan.

Corey arranges visitation with the girls while Leah moves her stuff out of Corey's house. Jenelle finds out she might be bipolar while in rehab. Chelsea decides to take the GED test. Kailyn confesses her hook up with Jo.

Leah and Corey go to mediation over custody of the girls, while Chelsea and Adam take a big step forward. Jenelle fails a drug test, and Kailyn tries to connect with her estranged mother.

Leah and Corey finalize their divorce; Chelsea's father learns that she is living with Adam; Jenelle goes against her lawyer's advice; Kailyn sees a picture of Jo and his girlfriend.

Jenelle gets set up with a boy, Leah and Jeremy become a couple, Chelsea sees a therapist, and Kailyn officially ends things with Jordan.

Leah tells Jeremy about her confusion regarding Corey, and Chelsea tries to get back on track with school. Things fall apart with Jenelle because she moved in too quickly with Josh and Kailyn goes to Texas and reconnects with her cousin and half sister.

Leah finds a bigger house to move into with Jeremy and Chelsea's dog goes missing. Jenelle breaks up with Josh, and Kailyn learns her mother Suzi visited Isaac behind her back.

Leah plans a birthday party for the girls; Chelsea convinces her father to help her move; Kieffer re-enters Jenelle's life; Kailyn meets a new boy.

Leah has news for Corey; Chelsea prepares for beauty school; Jenelle goes through with the paternity test; Kailyn and Jo fight about his new girlfriend.

Kailyn and Jo go to court; Chelsea has her first day at beauty school; Leah expresses feelings for Corey; Jenelle learns that Gary has slept with her best friend.

Leah is torn between Corey and Jeremy; Adam wants to see Aubree; Jenelle finishes probation; Kailyn takes Isaac to Jo's place.

Jenelle ends up getting back together with Kieffer. Chelsea reveals her pregnancy scare to her mom. Kailyn attempts to revisie her custody agreement for the second time. Jeremy and Corey have a talk about Jeremy's intentions with Leah.

Leah chooses who she truly wants to be with. Kailyn and Javi's relationship gets stronger when the two take a big step. Jenelle and Kieffer go back to their old ways.

As Kieffer ends up becoming the same bad influence, Jenelle tries to stay responsible. Leah starts to prepare for her upcoming wedding. Chelsea receives the news about Adam's new girlfriend. Kailyn is left rethinking her actions after she has a violent outburst toward Javi.

The day has come for Leah and Jeremy to get married. Meanwhile, Kailyn and Javi start to discuss their future and possible marriage. Adam attempts to make Chelsea jealous. Gary has a surprise in store for Jenelle.

A domestic violence incident between Gary and Jenelle sends them both to jail. Kailyn and Javi contemplate getting married in Las Vegas. Leah and Jeremy start their married life together by purchasing a new home.

Chelsea chooses to take a break from school. Leah tries to contact her biological father. After her fight with Gary, Jenelle goes to court.

Jenelle, Barb and Kieffer come together to celebrate Jace's third birthday. Wedding bells are ringing after Leah and Jeremy get married. Chelsea goes out for a night on the town to celebrate her 21st birthday.

Chelsea celebrates Aubree's third birthday. Jenelle's small chances of gaining custody of Jace are shown. Leah takes Ali to a doctors appointment. Kailyn has to inform Jo about her future with Javi.

Discovering that Jenelle is using drugs, Barbara tries to have her committed. Chelsea returns to beauty school. Kail and Javi get married before Javi is shipped off to Boot Camp. Leah’s daughter goes through medical testings.

Jenelle decides to terminate a pregnancy; Kailyn has a baby shower; Leah struggles with Ali's diagnosis; Chelsea contends with Adam having another baby.

Ali will need to use a wheelchair; Jo and Kailyn fight about Isaac's drop-off; Jenelle and Nathan decide to cohabit.