Zach and Tori Roloff's newborn son has achondroplasia. The stars recently revealed that their son, Josiah, whom they welcomed on April 30, has the same type of dwarfism that his dad and two older siblings — Jackson, 5, and Lilah, 2 — have. Tori, who wed Zach in 2015, does not have dwarfism.«He’s Josiah.