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

Her mother saw an AD in a Shanghai newspaper and figured that more Caucasian-looking eyes would make it easier for her unmarried 28-year-old daughter to find a husband.

她的母亲看到上海一份报纸上的广告后，就盘算着如果28岁的未婚女儿能够拥有一双外国白人那样的眼睛，将会更容易找到如意郎君。

youdao

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

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