birth mother

British  

noun

1. the woman who gives birth to a child, regardless of whether she is the genetic mother or subsequently brings up the child

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Example Sentences

She then found out that her son's birth mother was pregnant, and decided to put herself forward as a potential parent for this new baby, should that be needed.

From BBC

She and her husband adopted their son Leighton at the age of three, after he was removed from his birth mother when he was 18 months old.

From BBC

Mieke Murkes was an infant when her birth mother, Okgyun, gave her up for adoption.

From The Wall Street Journal

The child’s birth mother, Melodie Barnes, had split from her boyfriend after getting pregnant and, with the help of a Christian anti-abortion network, moved to Oregon, which then allowed mothers to put babies up for adoption without their fathers’ consent.

From Salon

Unable to cope, her birth mother placed her in an orphanage in the South Korean capital, Seoul.

From BBC