'Teen Mom' Stars and Their Kids

And Tyler and Catelynn celebrate Carly's 10th birthday, they open up about the adoption process.

If Tyler and Catelynn Baltierra had to do it all over again, the couple might not have selected the same parents to adopt their daughter Carly.

The reality TV stars put their baby girl up for adoption over 10 years ago on "Sixteen and Pregnant," before they continued their journey on "Teen Mom OG" and had two more children since.

With Carly's 10th birthday on the horizon, they both spoke about their "super not normal" situation on Monday's new episode of the MTV show. When a producer asked Tyler what he'd tell someone who was thinking up placing their child up for adoption, he said knowing other family is key.

"The only thing I would say, just make sure the family you want your baby to be raised with, you know very, very well. They're your kid's whole world," he said. Speaking of Carly's adoptive parents, Brandon and Teresa Davis, he added, "We know Brandon and Teresa were a little more reserved than we were. We weren't raised around that kind of lifestyle, so we're like, that's how these well-off people act."

"If we would have known what we know now, we might have been like, we want kinda people that are kinda just relaxed," he added.

Tyler also admitted the situation was probably just as odd for the Davis family, who likely didn't expect their child's birth parents to become reality stars, with Carly being a topic of discussion for a decade. "Our situation's super not normal," he added.

Speaking to the same producer, Catelynn also explained that the couple's daughter Nova doesn't fully understand the situation with Carly. "We don't get into too much detail because she's so young," she explained, "We just said she lives far away."

Catelynn also said that, when the time comes and Carly is older, she'd "tell her the raw reality" of why they put her up for adoption in the first place.

The couple and daughter Nova were later seen blowing out candles on a cake for Carly's birthday, with Catelynn saying she hoped they get to see her soon. A preview for next week teased an actual meet-up between the two little girls.

"It'd be fun to figure out a tradition of somewhere where we go do something as a family every year for her birthday," Catelynn later told Tyler. "Something kid friendly for the girls."

He took a "wait and see" approach to the situation, hesitant that the kids "might not care at all" about doing something like that. "One thing we never thought about was explaining it to our children," he then admitted about adoption, "especially our situation, we're still together."

"Teen Mom OG" airs Mondays on MTV.