How come princess children have no titles?

That's not entirely accurate! Princess children *do* have titles, but the specific title they receive depends on a few factors, such as:

* The country: Different countries have different rules for royal titles.

* Their parents' titles: The title of the parents often dictates the title of the child.

* The rules of succession: The line of succession can also affect the titles given to children.

Here are some examples:

* The United Kingdom: Children of the monarch are automatically Prince/Princess. However, grandchildren of the monarch are only Prince/Princess if their father is the heir apparent (Prince of Wales) or if the monarch grants them the title.

* Spain: Children of the King and Queen are Prince/Princess of Asturias, with additional titles like Duke/Duchess of a specific location.

* Denmark: Children of the Crown Prince and Crown Princess are automatically Prince/Princess.

So, while some princess children might not have the same titles as their parents, they usually still hold some form of royal title. It's important to consider the specific country and royal family's rules when determining titles.