Kristine, however, envisioned having kids once Keith is done with medical school, which would apparently take another five to seven years.
"You know, it's funny. [Keith] is living in a bit of a dream world," Kristine told Unfiltered host Jamie Otis.
"You still have to go through school and that's going to take a few years, and it's just like, you're not going to be ready! How are you going to be able to focus on what you're doing and we have multiple kids and a dog? It's just not realistic."
When Married at First Sight's eighth season began production, Kristine was 28 years old and Keith was 29 years old.
Keith has made it known on the show he'd love to be a father by age 30 to avoid becoming the old man at the children's playground, unable to keep up.
"My ideal timeline [for kids], I don't know why, but randomly I've always had the number 32 in my head," Kristine shared.
When Jamie pointed out that's no time at all, Kristine explained, "I will be ready to have kids at that point. Is he going to be in the position [to be ready]?"
The show currently airs on Tuesday nights on Lifetime, and the latest episode featured the couples navigating their relationships with only one week left until "Decision Day," when they must decide whether to stay married or get divorced.