The baby, Jackson Roloff was born weighing a little over 9 pounds and measured 20.5 inches long.
Even though Tori is about 38 weeks into her pregnancy - which means she still has about two more weeks to go before her due date - that didn't stop fans from speculating that she had already given birth. Congratulations to Zach and Tori!
"Jackson has already mastered holding daddy's fingers and snuggling with mom!" he shared.
During the show, Zach discussed the possibility of having a son with dwarfism. The couple, who got married in 2015, announced that they were expecting last November and then threw a gender reveal party after they found out that their child would be a boy. "Zach, you are the best listener, you're so patient, I love the way you think of others, how you put others first, and you're always willing to drop everything to help someone", she captioned the photo.
The former couple's son Zach, 26, and his wife Tori welcomed their first child, a son named Jackson Kyle Roloff, on May 12.
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The Roloff family is also expecting another addition this summer.
"What am I going to say?"
Zach and Jeremy's parents, Matt and Amy, have been amicably and excitedly gearing up to become grandparents a year after their divorce was finalized. "I can't wait for that kid to be bullied?'" Zach told his twin in one episode.
Catch more of the family on the 11th season of Little People, Big World - which airs Tuesdays on TLC.