Babies are shaking up the lives of new and expectant parents. Autumn and Matthew face challenges bigger than raising a baby on their boat. Jamielynn wants Matt to marry her. Aly and Josh endure a parent's worst nightmare.

Autumn and Matthew try to set aside their differences for the baby. After three miscarriages, Julia and Ryan pray she can carry the triplets to term. Matt shocks Jamielynn. Aly struggles with a side effect from her cancer.

An unexpected turn complicates Julia's triplets pregnancy. Jamielynn's water breaks early. Mariah and Raymond meet each other's families for the first time. Autumn's mom worries about a baby living on a boat.

Jamielynn juggles caring for a newborn and toddler alone when Matt returns to work. Autumn tries to avoid being induced. Julia and Ryan navigate the NICU life. As Mariah's due date approaches, her fear of childbirth grows.

Mariah's labor escalates into a life or death situation. Julia and Ryan feel unprepared when the first baby comes home. Jamielynn gives Matt an ultimatum after talking to his ex-wife. Aly and Josh go on a chaotic road trip.

Mariah and Raymond's baby bliss is cut short when Raymond expresses doubts. The triplets' medical issues haunt Julia. Autumn's labor brings her and Matthew closer. Matt confronts Jamielynn for seeing his ex.

Autumn and Matthew bring their baby home to the boat and an uncertain future. Things blow up between Raymond and Mariah's mother. Julia may need help caring for the triplets. Matt and Jamielynn are still not engaged.

When Mariah and Raymond apartment hunt, a bigger issue emerges. Julia faces high emotions when she leaves the triplets at home for work. Autumn and Matthew turn to therapy to help them co-parent. Josh plans a big surprise for Aly.

Jamielynn expects a proposal when she finds a hidden ring. Mariah and Raymond compromise when a church won't baptize Royce. Aly and Josh make a monument to their relationship. Autumn and Matthew make a decision on their marriage.

The Sadler triplets are out of the woods and free to meet the world. Autumn and Matthew leave the boat and try to figure out how to co-parent. Mariah and Raymond finally leave Barb's house. Matt makes a decision.