noun
illegitimate birth
Formal or legal term for giving birth to a child whose parents are not married. Often used in official documents or discussions of family law.
私生児出産の届け出には、母親の署名が必要です。
The mother's signature is required for the notification of an illegitimate birth.
Compound of 私生児 (illegitimate child) and 出産 (birth). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.