Zach And Tori Roloff Just Welcomed Their Second Child

“Zach and I are so excited to introduce you to our sweet baby girl Lilah. She has been the perfect addition to our family!” Tori said.

When they announced their second pregnancy, they did so by sharing a shot of Jackson in a shirt that read "Big Brother."

Zach wrote, "Tori and I are excited to announce that Jackson is going to be a big brother to a little sister!!"

"Zachary and I are so excited to announce that Jackson is going to be a big brother! We are expecting a sweet baby girl this November!" she wrote.

"SHE IS PERFECT we love her so much already," said Lilah's new aunt Audrey Roloff in an adorable Instagram comment, and Isabel Rock added on, "Uncle Jacob and Aunt Izzy love her so much already.”

Dwarfism is a dominant gene, which means that there is roughly a 50% chance that any of Zach's children will be born with the gene.

They found out at 34 weeks pregnant that their son Jackson would be a little person.

"There was obviously some fear, but I have the best resources at the palm of my hand and I was fortunate enough to have some background knowledge," Tori said.

"I can only imagine the fear of a parent who has no experience with dwarfism but I can only hope we can provide some sort of reassurance to them," Tori said.

In a now-deleted Facebook Live video a week before the new baby was born, Amy told fans that Lilah "will be a little person."

“So, I commend Tori, she’s a good mom. I also commend her because realizing when you’re not used to it, she’s going to be the different one in her own family, instead of maybe Jackson or something like that,” she added.

This lead some people to believe that Zach and Tori hadn't planned on announcing this information to the world yet, although that hasn't been confirmed.

Regardless, the baby is happy, healthy, and very much loved.

We're wishing the new family of four all the love and happiness in the world on this special occasion.

Welcome to the world, Lilah!