A person who has no siblings. / A person raised as the sole child in a household.

(chiefly Canada, US, idiomatic) One who is a prototypical or quintessential example of something.

(euphemistic) A child who is particularly difficult to raise or educate, especially due to a lack of self-control and disruptive and antisocial behavior.

A child in a developing country whose parents have found employment abroad. The stereotype is one of relative financial well-being, but emotional detachment from the parents.

Any of several devices for carrying babies or very young children within a sling or framework worn as a backpack or on the front of the body

(criminology) Physical, sexual or emotional mistreatment of a child that causes long-term or permanent damage.

A child in foster care.

(of a person or couple) Having no children, biological, step, or adopted, as a matter of choice.

A child who has grown up in wartime.

A diligent and industrious person.