with achondroplasia like his dad and siblings. During a previous episode, Tori explained that Jackson's procedure involved putting plates on the growth plates of his legs to «hopefully slow down the growth and allow the bones to even out.» In May, Jackson celebrated his fifth birthday, but his parents have not shared any further updates on his surgery recovery. Tori and Zach Roloff Prepare for Son's Leg Surgery (Exclusive) Zach and Tori Roloff Share Newborn Son's Achondroplasia Diagnosis Tori and Zach Roloff on Baby Josiah's Early Birth and Family Drama 'Little People, Big World's Zach and Tori Roloff Welcome Baby No.