'Worldschooling' their 4-year-old child, this family has traveled to 23 countries so far this year

"You won't be able to travel anymore after having children." Carol Tan, 36, and Rakcent Wong, 35, often received that age-old advice before having their son, Atlas — but they were determined to prove the naysayers wrong.

The Singaporean family took a sabbatical from work to "worldschool" their 4-year-old child and has traveled from Switzerland to Denmark to Nepal, across 23 countries since the start of the year.

Simply put, 'worldschooling' refers to making the world once classroom.

Sometimes, it involves parents who choose to embark on a "family gap year," and take their children out of their hometown schools to introduce them to different parts of the world, helping them learn through immersive experiences that quench their innate curiosity.

While some families take a more structured approach by enrolling their kids into schools abroad or by creating their own curriculum, much like how homeschooling is, others take a more flexible approach.

After meeting in 2011, Tan and Wong fell in love and soon found a mutual passion for traveling.

"Our style of traveling before we had Atlas was a little 'off the beaten path' type," Wong told CNBC Make It. From going to Iceland on a camper van and motorcycling across Southeast Asia, to sleeping in the desert in Egypt and exploring a safari in Sri Lanka, the couple loved being adventurous in their travels.

"We realized [that] after every trip, we always gained something — there's some kind of growth and transformation that we experience, just both on a personal level and as a couple," Wong said.

Tan and Wong decided that they would not only continue to travel, but also bring Atlas along with them. "We [knew] that traveling is going to be so beneficial for him, especially in his formative