birth mother

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The carpenter’s wife, who had been hired as a wet nurse for Teacher Fei when he first left his birth mother, had returned to the house years later with the news.
在范老师刚离开自己生母的时候，木匠的妻子曾被雇来做保姆，一年后得到这个消息回了家。
The dividing line between an ethical adoption and a baby-buying scam generally falls on the issue of whether the birth mother has been coerced into giving up her child.
区别合乎道德的收养儿童与违法犯罪的拐骗儿童之间的分界线，往往在于孩子生母的态度，究竟是自愿放弃孩子还是被迫离开孩子。
These aren’t about saving children from terrible circumstances but about the reunion of the child with the birth mother and the rediscovery of the adoptee’s lost culture.
这些故事并不是关于孩子们是如何从恶劣的环境中被解救出来，而是关于孩子与生母的阔别多年重逢，关于被收养者本族文化失落后的重新追寻。

And every minute and a half, another mother dies giving birth somewhere in the world.
Most poets who write nativity poems are interested in the miracle of the virgin birth, emphasizing the Virgin Mary and the tender mother-son relationship between Mary and Jesus.
大多数写基督诞生的诗人都是对,处女生孩子这个奇迹感兴趣，强调玛丽是个童真女子还有玛丽与耶稣之间,脆弱的母子关系。
耶鲁公开课 - 弥尔顿课程节选
In this case, if everything goes right, you inject the DNA into the pronucleus, you implant this fertilized egg into a foster mother, the mother gives birth to offspring, it develops and when it develops this foreign DNA is in the offspring.
如此一来,如果一切顺利,DNA成功注射进原核,受精卵成功植入代孕母亲,成功的孕育了后代,后代健健康康的长大,目的基因就成功的整合进了后代的基因组
耶鲁公开课 - 生物医学工程探索课程节选

Aaron was curious about his birth mother, and they reunited when he was about 12 years old.
NPR: Mother and Son Offer Transracial Adoption Insights

the woman who gave birth to a child, although she may not now be the child's legal mother

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