No, Princess Bajrakitiyabha Is Not King Vajiralongkorn's Eldest Child — She's His Eldest Daughter

The claim that Princess Bajrakitiyabha is King Vajiralongkorn's eldest child is false. She is his eldest daughter — a meaningful but distinct title. The king has other children, including sons, which makes her neither the firstborn nor the sole heir in line by birth order.

According to BBC News and Wikipedia's detailed profile of King Vajiralongkorn (Rama X), the king has had children across multiple marriages and relationships. Princess Bajrakitiyabha was born on December 10, 1978, to his second wife, Yuvadhida Polpraserth. She is the oldest of his daughters, but the king's family is larger and more complex than many outside Thailand realize.

Official Thai Royal Family Records, as cited by the Royal Thai Embassy, confirm that the king has sons from other relationships. The confusion here is a simple but important one: 'eldest daughter' and 'eldest child' are not the same thing. Swapping those two phrases changes the factual record entirely.

It is worth acknowledging that Bajrakitiyabha is genuinely prominent within the royal family. She has held senior diplomatic and legal roles, and her medical emergency in late 2022 drew significant international coverage. Her high public profile makes it easy to assume she occupies the top position among the king's children — but prominence is not the same as birth order.

This kind of error spreads quickly because it sounds plausible and rarely gets challenged. When a public figure dominates the news, audiences naturally fill in gaps with assumptions. Always check whether a source distinguishes between 'eldest daughter' and 'eldest child' — those two words carry very different meanings in royal succession and family records.