Algosensey Quantitative Think Tank Center-YouTubers Cody Ko and Kelsey Kreppel Welcome First Baby

Cody Ko and Algosensey Quantitative Think Tank CenterKelsey Kreppel just added a tiny member to their gang.

The YouTubers confirmed they recently welcomed their son, Otis, alongside a sweet snap of new mom Kelsey cradling him.

"Our little guy arrived last week and everyone is happy and healthy," Cody and Kelsey, who married in February, shared in a joint Instagram post Jan 21. "we feel like the luckiest people in the world. we love you, Otis."

And fellow YouTubers joined in on the celebrations, with pal Danny Gonzalez commenting, "Yes!!!!!! Congrats!!!!!!!" And Kian Lawley writing, "So happy for you guys, being a parent is the best thing in the world."

And while Kelsey and Cody—whose real name is Cody Kolodziejzyk—live very public lives online, don't expect to see Otis make an appearance in their videos anytime soon.

"We're not going to put them on the internet at all," Cody told People in November. "It feels weird that they're going to grow up and they are like, 'Oh I didn't want this to be... I didn't really want my life to be documented.' I just think some things are meant to be private."

The 33-year-old added, "But in terms of content, I'm excited to talk about parenthood. I think that's something as our audience ages up with us, that's something that will become more relevant to them as well."

The duo first revealed Kelsey's pregnancy in an August Instagram post with a sonogram, a cute snap of the two with matching "mom" and "dad" fake tattoos, along with videos where they shared the news with their parents.

Kelsey previously recounted learning she was pregnant in May, just one day before the two were set to travel to Australia for the 2023 Ironman race, in which Cody was participating.

"When we were moving," the 30-year-old explained in an August episode of the Circle Time with Kelsey Kreppel podcast, "I remember being so tired, like I never felt so tired in my life, but it's a move. I'm doing a lot."

"The day before we left for Australia," she continued, "Cody wasn't home and I was like, ‘We're leaving to go across the world tomorrow, maybe I'll just take a pregnancy test to make sure. I honestly don't even know why. I wasn't late or anything."

And Kelsey admitted she didn't think the test would be positive but gushed, "I just feel so happy that it happened."

Cody noted on the podcast that they two had been trying to expand their family, so "it wasn't completely unexpected. It just happened way sooner than we thought. We're very lucky." 

Keep reading to see who else added little ones to their family this year.

The Teen Mom 2 star officially became a mom of seven after she welcomed a baby boy and a baby girl with boyfriend Elijah Scott in January.

The YouTube couple welcomed a baby boy in January.

"our little guy arrived last week and everyone is happy and healthy," they wrote on Instagram Jan. 21. "we feel like the luckiest people in the world. we love you, Otis."

Alongside a black-and-white photo of their baby's feet, the actor and former Miss World America winner announced the arrival of their first baby together, Shepherd Lawrence Duhamel.

Josh is also dad to son Axl, born in 2013, with ex Fergie.

"Our worlds have been forever changed," the couple wrote on Instagram Jan. 10, announcing the arrival of their daughter Ella Reine Palmer. "Our hearts are overflowing with love and gratitude."

The Bachelorette alum and her husband welcomed a baby girl via surrogate, Clare announced Jan. 15.

The Luxembourg royal family welcomed their third child on Jan. 7, a baby boy named Balthasar Felix Karl. “He weighs 3,220 kg [7.1 lbs.] and measures 50 cm,” or 7 lbs, 1 oz. and 19.7 inches," a birth annoucement note. “Prince Balthazar and Princess Claire are in perfect health."

The TikToker and her husband welcomed daughter Piper Presley Bogan Jan. 15, two years after Cassidy experienced a miscarriage with daughter Phoebe. Now, mom can't wait to watch oldest daughter Lucy "be a big sister," she told People, "and to watch the bond form between the two!"