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On this week’s brand new episode of Little People, Big World, Tori Roloff and Zach Roloff are given a cause for huge concern.

And that cause centers around their oldest child, Jackson.

The five-year old had surgery on his leg this past December to help fix an issue brought about by achondroplasia, the type of dwarfism that affect Jackson, his two siblings, his paternal grandparents and also his dad.

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“It’s the beginning, I think, of a long journey,” Zach said of his son and his bowed legs in summer 2021 after doctors recommended a procedure on Jackson.

This procedure took place a few months later.

And the Little People, Big World episode that airs on June 21 was filmed shortly afterward.

“There is legitimately something wrong,” Tori says in a sneak peek shared online by Entertainment Tonight.

“He isn’t progressing like they said that he would.”

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The goal of this surgery, Tori previously said on air, was to “slow down the growth and allow the bones [in Jackson’s legs] to even out.”

Following some complaints of pain by the toddler, Tori decided the couple would “make sure that there’s no actual structural damage” by checking in with their doctor.

In this same clip, Zach tells his mother, Amy:

“If something isn’t healing right or growing right, I want to adjust — especially before this new baby comes.”

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Just a few weeks after this installment was shot, the Roloffs welcomed their third child together, a son named Josiah, who was diagnosed with achondroplasia — just like his dad and siblings.

Due to Matt Roloff’s physical ailments, the father of four has undergone 15 surgeries over the years.

He can only walk with crutches these days.

Zach, for his part, had a pair of surgeries on his legs as a child, also due to bowed legs… and they went well. He can mostly walk just fine as an adult.

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Tori and Zach Roloff with son Jackson and daughter Lyla are pictured here. Could they be any cuter?!?

Speaking to Us Weekly this spring, Zach noted Jackson’s progress, telling the tabloid in May that “he is doing great. Everything’s great.”

The TLC personality added that it will take about “four or five years” to see the change in his son’s legs, noting that people often wonder why they still look bowed.

“It’s not an overnight fix if you will,” he explained at the time.

Thankfully, however, this interview was granted and this message passed along long after the sneak peek cited here was filmed… so it’s comforting to know Jackson is on the mend.

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In this same sit-down, meanwhile, Tori said Jackson is only just starting to “connect” with his condition.

“I was watching dwarf soccer — a bunch of dwarfs play in a game on YouTube — and [Jackson] goes, ‘Why are those players so short?'” Zach recalled to Us.

“And he was looking at some fans with the coaching staff. He’s like, ‘Those players are tall, you know?’

“And I was like, well, those players have dwarfism. They’re like you and I.”