EXCLUSIVE: Sean and Catherine Lowe Open Up About Parenting & Wanting More Kids: We 'Have a Heart for Adoption'

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After 21 seasons of The Bachelor, Sean and Catherine Lowe have been the only couple who got engaged on the show and ended up actually tying the knot and making their marriage work. Now, the pair share a 9-month-old son, Samuel, and they couldn't be happier.

The couple sat down with ET's Lauren Zima at their home in Dallas, Texas, where they opened up on how they've kept their lives harmonious since welcoming their adorable little boy.

"We have a really good balance right now. We are really passionate about what work we do. We have a sweet baby boy and our marriage is going so well," Catherine shared. "Every duck is in its row."

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The proud parents explained that finding that balance with their young son took some time, and the first few months saw "a lot of trial and error," but as they've gotten comfortable with sharing and delegating responsibility, they've come to grasp the importance of "the division of labor."

"I think we hit a sweet spot," Sean divulged. "We're in a good spot right now."

The 33-year-old new dad said he now understands how much more pressure new moms are under in the first few months of their babies' lives than fathers, including breastfeeding and the fact that "the baby physically needs to be with [their mom]."

Catherine added that she recognizes that new moms face "a lot of struggles," but said she feels it's important to make sure neither parent feels emotionally neglected.

"You really have to tap into what the other person is feeling, to respect them and to understand how to move forward," she said.

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"I think Catherine does a great job of trying to be the best wife and mother she can be," Sean added. "That puts the pressure on me and I feel like I need to help her out as much as I can, too, because I need to reciprocate that."

Sean and Catherine met during season 17 of The Bachelor in 2013, and got engaged in the finale. The couple tied the knot in a televised wedding the following year and welcomed Sam in July 2016.

According to Catherine, she "always knew [Sean] would be a fantastic dad," and he hasn't proven her wrong. She praised her husband for always being enthusiastic about helping around the house and never shying away from his obligations as a parent.

"It's really nice to have a partner," she shared, adding that it's been a joy to see Sean's potential as a dad "come to fruition" over the last nine months.

For Sean, watching his wife grow and develop as a mother has "just added another level of appreciation" for her.

"She already worked extremely hard at business and at being a great wife, and now the huge responsibility of raising a child and she's just taken it on and she's done so well," he marveled. "She loves that little boy so much and she spends so much quality time with him. It's really inspiring for me to watch."

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While they pair are dedicated to parenting and sharing as much love as humanly possible with their little guy, they are also working hard to reinforce their love for one another, and they do so with the little gestures that mean the most.

"The nice thing about having a baby is that they go down early!" Sean said, adding that Sam usually heads to sleep at around 7 p.m., giving them about two hours to spend by themselves before their own bedtime.

"It's kind of reminiscent of the old days when it was just us on the sofa, watching TV together, holding hands or whatever, and that's what we do every night," he explained. "Throughout the day I try to hug her and kiss her and tell her I love her as much as I can and she still does really sweet things, drops me little notes telling me that she appreciates me or things like that, so I think we've done a pretty good job keeping the romance alive."

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Another way the happy couple has been keeping things in balance is by working on projects that allow them to spend time together -- namely their new furniture line, Home By Sean & Catherine Lowe.

"It's been a passion project of ours because we're all about family and being at home and being comfortable but still kind of being sleek and stylish at the same time," Sean said. "So that's kind of the MO of our line is we just want things that look good but are also really comfortable."

While the pair said they feel like they're finally in "a good groove," they are excited about expanding their family in the future. And, if Catherine has her way, they could expand quite a bit.

"I'm the person that wants a soccer team as a family and have a compound and everyone sleeping together in bunk beds and all that stuff. So yeah, there will definitely be more… I think five. Three natural and two adopted. That's my vision," she said. "We're probably going to start trying soon."

WATCH: 'Bachelor' Couple Sean and Catherine Lowe Proudly Rock Matching Pajamas With Son Sam

While Sean is on board for having more kids, he seemed a little hesitant when it came to expanding too quickly.

"[Growing up], it was just me and my sister. Two is a great number. I could do three. I think four, that can be out of control sometimes. I would say three is a good number," Sean said. Although he echoed Catherine's desire to adopt a child, adding that they "both have a heart for adoption."

The pair also opened up about how they've managed to stay together while so many other reality show relationships have fallen apart.

"Part of our success comes from the fact that we're not the typical Bachelor couple," Sean said. "We don't do a lot of the Bachelor reunions and go and meet up -- that's just not us. We live our own life and do our own thing, so we don’t really feel that pressure and that’s the way we like it." Check out the video below to hear more.