Kate Chastain's Son Sullivan Makes His TV Debut Dressed Just Like Her “Below Deck” Costar Captain Lee

Sullivan, born in May, appears alongside his mom on Monday's finale episode of 'Couch Talk with Captain Lee and Kate'

Kate Chastain's son Sullivan is making a big splash in his TV debut!

The 5-month-old, whom the Below Deck alum welcomed in May, is set to appear on Monday night's finale episode of Bravo's Couch Talk with Captain Lee and Kate.

As seen in a preview clip of the episode posted on Bravo's Instagram page, Sullivan is fittingly dressed for the occasion in a tiny white captain's uniform, complete with a bow tie in a nod to his mom's co-host, Captain Lee Rosbach.

"Our very exciting guest is ready. He dressed up just for you," Chastain, 40, tells her former Below Deck boss.

"And quite smartly, I might say," Rosbach, 73, replies, before cooing to Sullivan as he nestled in Chastain's lap: "So nice of you to be awake while I'm here."

Chastain then jokingly explained the reason for his usual sleepiness: "He's always been on anchor watch."

When Rosbach asks if he can hold Sullivan, Chastain hesitates for a moment before lifting Sullivan up to do the smell test on his diaper. "Actually, yeah, he's ready! He's ready!" she says, laughingly implying it's Rosbach's turn on diaper duty.

Chastain — a yacht stewardess who starred alongside Rosbach on six seasons of Below Deck before exiting the show in February 2020 — first announced her pregnancy in December.

"I am absolutely thrilled to become a mother," she told PEOPLE at the time. "It's something I've always hoped for so this is truly a dream come true!"

Shortly after sharing her happy news, Chastain showed off her growing baby bump on Instagram. Alongside a photo of herself posing in a flower-print sundress, she wrote, "I'm already planning so many birthday theme parties for you 💗💙💗."

Related: Pregnant Kate Chastain Says She 'Wasn't Sure' Motherhood Would Happen for Her: 'I'm So Lucky'

Back in January, while appearing on Watch What Happens Live, Chastain got emotional when she revealed that she wasn't sure she'd get to experience motherhood. When host Andy Cohen asked her if she "always wanted a kid," she told him, "I did but I wasn't sure if it was going to happen for me, so I just feel so lucky."

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On WWHL's aftershow, Chastain — who has not publicly revealed the identity of her son's father — said she was planning to raise Sullivan on her own. "I'm doing it solo and perhaps with some help, but I'm happy to do it alone," she told Cohen, 55.

After Sullivan made his grand arrival, Chastain shared the first photo of her son on Instagram. "Hard launch: Sullivan Cay," she wrote, alongside a snapshot from her hospital room capturing her holding the newborn, who was swaddled in a striped blanket.

Related: Kate Chastain Shares Photo of Sleepy Son Sullivan, 5 Weeks: 'Oxytocin Levels Through the Roof'

About two months later, she posted a lighthearted video poking fun at the realities of parenting an infant. "10 weeks later I think I’ve figured out how to get him to sleep," she wrote, alongside footage of her rocking Sullivan in her arms as she paced all around her home in changing outfits as the days passed.

On Sunday, Chastain shared another clip of Sullivan on Instagram, showing that he's already embracing his mom's boat-loving lifestyle. The pair could be seen enjoying a walk in the Florida sunshine by a marina, with several boats docked behind them.

"It dropped below 90 degrees today so obviously we’re out celebrating the start of fall 🍂🍁," she wrote in her caption.

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