firstborn (child)
Tom y Mary esperan tener su primogénito el próximo mes.
Tom and Mary are expecting their first child next month.
El primogénito heredó toda la propiedad.
The firstborn son inherited the entire property.
Tom es mi primogénito.
Tom is my firstborn son.
La pareja llamó a su primogénito Mark.
The couple named their firstborn Mark.