In the Season 3 premiere, Autumn and Matthew face a challenge bigger than raising a baby on their tiny boat; Jamielynn wants boyfriend Matt to stop behaving like he’s single; and Aly and Josh endure a parent’s worst nightmare.

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

An unexpected turn complicates Julia’s pregnancy with the triplets; Jamielynn’s water breaks weeks early; Mariah and Raymond, together nine months, meet each other’s families for the first time; Autumn’s mom worries about the baby living on the boat.

Jamielynn juggles caring for a newborn & toddler alone when Matt returns to work. Overdue Autumn tries everything to avoid being induced. Julia & Ryan navigate the heartbreak of NICU life. As Mariah’s due date approaches, her fear of child birth grows.

Mariah and Raymond's baby bliss is cut short when Raymond expresses doubts; the triplets' medical issues haunt Julia even after they've been released from NICU; Autumn's labor brings her and Matthew closer; Matt confronts Jamielynn for seeing his ex.

Autumn and Matthew bring their baby home to their boat and an uncertain future; things blow up between Raymond and Mariah's mother; an overwhelmed Julia may need help caring for the triplets; Matt and Jamielynn discuss deployment.

When Mariah and Raymond apartment hunt, a bigger issue is brought up; Julia faces an emotional rollercoaster when she leaves the triplets at home to return to work; Autumn and Matthew turn to therapy to help them co-parent.

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 permanent monument to their relationship; Autumn and Matthew make a final decision about their marriage.

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