Zach Roloff made son Jackson's first birthday a family celebration.

The 28-year-old and his wife Tori Roloff hosted an outdoor party on their baby boy's birthday Saturday.

Zach's dad and "Little People, Big World" co-star Matt Roloff shared a photo from the fete Saturday on Instagram. The camp-themed party took place at the Roloff family farm in Oregon.

"Happy Birthday baby J. What an incredible day of celebrating your 1st year of life!" Matt captioned the picture.

Matt also shared a video Sunday of Zach and Tori helping Jackson open his birthday gifts.

"Zach and Tori hosted the most amazing little birthday day celebration for a Jackson yesterday still smiling about all the fun," he wrote.

Tori shared a family photo with Zach and Jackson on her own account.

"...and somehow we have a one year old? Happy birthday Mister Mister. We love you more than you will ever know. #babyjroloff," she captioned the picture.

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Jackson, Zach, Matt and Zach's mom, Amy Roloff, all have dwarfism, while Tori is of average height.

Zach said in an interview with People in May 2017 that the condition won't stand in the way of his son's goals.

"The world is changing. People are more open to diversity," the star said. "Whatever he wants to do, we're going to find a way to help him do it. That's our job in life now."

"[Dwarfism is] part of the whole package of who he is," he added. "He's happy and healthy. That's all that matters."