Translation guide
In Japanese, the concept of an 'only child' is expressed with specific nouns. The most common and neutral term is 一人っ子 (hitorikko). There are also more formal or written terms. This guide covers how to say 'I am an only child' and related expressions.
I am an only child.
Referring to a person who has no siblings, either as a child or adult.
The most common and neutral word for 'only child'. Used in everyday conversation for both children and adults. Can be used for oneself or others.
I am an only child.
She is an only child, so she says she wants siblings.
Means 'only daughter'. Used when the only child is specifically a daughter. Often used by parents to describe their daughter.
Our only daughter is getting married next year.
Means 'only son'. Used when the only child is specifically a son. Often used by parents.
He is an only son and was raised with great care by his parents.
A less common, slightly more literary or formal term for 'only child'. Can also be written 一人子. Not typically used in casual speech.
He grew up as an only child.
一人っ子 can be used for adults as well as children. It is not childish or informal. You can say 私は一人っ子です even as an adult.
一人っ子 is gender-neutral and means 'only child'. 一人娘 specifically means 'only daughter', and 一人息子 means 'only son'. Use 一人っ子 when gender is unknown or irrelevant, or when speaking about yourself.