Hijo único es la expresión que hace referencia tanto a la paternidad limitada a un solo descendiente, decidada o sobrevenida, como a las políticas de control demográfico que promueven la paternidad única.

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An only child is a person with no siblings, either biological or adopted. The term only child is generally applied only to those individuals who have never had siblings. An only child, however, may have half-siblings or stepsiblings who come along considerably late (after they reach their teens) and still be considered an only child. Children with much older or younger siblings (generally ten or more years) may also have a similar family environment to only children.

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