Unmarried mother, pregn an cy at an early age, or first pregn an cy.

未婚妈妈，产妇年纪太轻，或者是首次怀孕。

youdao

Illegitimate child. Old, denigrating, and now obsolete term for the child of an unmarried mother.

i私生子为老旧的、诋毁名誉的并且现今废止了的术语，意思是未婚母亲所生之子。

youdao

In 2017, though unmarried, she decided to become a mother.

在2017年，虽然还没有结婚，但是她决定成为一名母亲。

youdao

His mother was an unmarried teenager and in an autobiography he describes hitch-hiking with her as a three-year-old and having to beg at age four.

BBC: Tom Connors file picture November 2009

However, six weeks earlier, Gonzalez and Mildred got married, canceling Mildred's ability to apply for legal status through her mother because she was no longer an unmarried daughter under the age of 21.

CNN: U.S. sailor: Don't deport my wife

Her mother frets that at 31 she is still unmarried.

ECONOMIST: A revolution in the workplace meets little resistance