The content creator and her husband Seth welcomed their fourth baby together on Tuesday, Dec. 12, they tell PEOPLE exclusively.

The pair, who are already parents to three girls -- daughters Kennedy, 5, Evan, 3, and Michal, 17 months -- welcomed her first boy, son Koda Kade. His first name means "friend" and his middle name means "warrior," Gibson explains.

"He is already the absolute sweetest, and we are settling into being a family of six wonderfully so far," Gibson says, adding that her three daughters are "absolutely obsessed" with their baby brother and "switch off holding him all day long."

According to Gibson, she developed cholestasis in her 36th week of pregnancy. She went into labor three weeks early and gave birth in a tub before the midwives arrived, welcoming her son at 11:52 p.m. at 37 weeks with her husband by her side.

"I still wanted an unmedicated home birth experience, so I did everything I could to naturally induce myself and things progressed faster than I ever could have imagined," Gibson recalls. "It was terrifying and beyond special and unforgettable at the same time."

She adds, "I sat in our tub in complete shock and waited for the birth team to arrive. We both believe it was meant to happen that way."

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Gibson first announced the news that she was pregnant with her fourth child on May 10.

"This ain't our first rodeo... 💛 Baby Gibson # 4 coming January 2025!" she captioned the post, featuring a moving Instagram video alongside her three girls and husband.

In June, Gibson revealed on Instagram that the gender was a boy.

"Can't wait to meet you, baby. You have no idea how blessed you are to join your tribe of gals!" she captioned a video, announcing the news.