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

Jenelle meets a new guy; Chelsea has her first day of school; Kailyn and Jo fight about her move to Delaware; Leah goes on vacation.

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

Jenelle moves in with Nathan; Chelsea invites Adam to pick up Aubree from pre-school; Kailyn and Javi put in an offer on a house.

Jenelle and Nathan discuss having a child together. Corey has a difficult time with the news that Ali needs a wheelchair. Kailyn starts planning for her wedding.

Chelsea throws Aubree's birthday party; Kailyn and Jo got to court; Jenelle and Nathan believe they are pregnant; Jeremy returns home after passing out at work.

Kailyn has a meltdown; Leah and Jeremy meet with Corey to discuss Ali starting school; Aubree meets Adam's baby; Jenelle learns a plea bargain may be possible.

Adam sends Chelsea a visitation request; Jenelle undergoes surgery; Kailyn goes for a fitting for her wedding dress; Leah and Corey support Ali on her first day of school.

Aubree attends her first dance class; Jeremy and Leah disagree; Jenelle and Barbara argue about Barb's fight with Nathan; Kailyn realizes her mother will not attend her wedding.

Kailyn and Javi celebrate their wedding; Chelsea graduates from esthetician school; Jenelle accepts a plea; Jeremy turns down a local job.

Javi takes Isaac to Jo's; Adam responds to Chelsea's objection; Ali tests her wheelchair; Leah struggles with Jeremy's absence; Jenelle and Nathan get exciting news.

Kailyn's baby is born; Chelsea struggles with the visitation agreement; Leah and Jeremy focus on their relationship; Jenelle is pregnant.

Javi returns to work, leaving Kailyn with the children; Jo finds a new apartment; things get worse between Nathan and Jenelle; Chelsea receives news about Adam; Leah learns the cause of Ali's illness.

Jenelle learns the gender of her baby; Ali becomes aware of her condition; Kailyn strives to raise two children and maintain her marriage; Chelsea receives unexpected news.

Jenelle and Nathan prepare for his approaching jail time; Chelsea moves into her new house; Kailyn invites Jo and Vee to Isaac's birthday party; Leah struggles after receiving bad news.

Leah begins taking anxiety medicine; Kailyn and Javi visit Joe and Vee's apartment; Nathan gets ready for jail; Jenelle worries about being alone; Chelsea meets with a lawyer.

Jenelle struggles to take care of Jace while Nathan is away; Leah and Jeremy disagree over finances; Chelsea looks into Adam's legal charges; Kailyn celebrates her birthday.

Leah and Jeremy visit Ali's specialist; Jenelle and Nathan reunite upon his release from jail; Chelsea learns about Adam's court appearance; Javi departs on a trip for work; Kailyn feels lonely.

Jo and Vee visit Kailyn, whose estranged mother has shown up; Chelsea gets word about her esthetician license; Corey's father helps Leah with Ali's wheelchair; Jenelle starts the divorce process.

Chelsea must deal with the consequences when Adam is arrested again; Leah tries to manage jealousy between the twins; Nathan and Barbara clash; Kailyn tries to explain Javi's absence to Isaac.

Jenelle and Barbara clash over Jace's behavioral difficulties; Kailyn tries to get the children ready for Javi's return; Leah takes Corey to court; Chelsea learns of Adam's new girlfriend.

Kailyn and Jo disagree about Isaac's visitation schedule; Chelsea meets Adam's new girlfriend; arguments erupt at Jenelle's baby shower.

Jenelle gives birth to a second son; Leah learns that Corey wants full custody of the girls; Isaac leaves for summer visitation with Jo; Chelsea is shocked when Adam's ex returns.

Jenelle approaches Barbara about gaining custody; Kailyn reunites with Isaac; Chelsea tries to move on romantically.