She decided to 'put/give the baby up for adoption'. [=to make it possible for other people to adopt the baby]
They chose 'adoption' because they couldn't have children of their own.
the unanimous 'adoption' of the resolution by the Senate
(..) Come on, she's gonna love you guys. Thank you. But we're trying not to get our hopes up. A lot could still get in our way. She could decide against adoption, like another couple better. What are you gonna name it? I could develop a condition in which I talk and talk and no one hears a word. (..)2004 TvShow: Friends Title: The One with the Birth Mother Season: 10 Episode 9
(..) - Hey. We're here to say goodbye. We're off to Ohio. Oh, right, your adoption interview. Yep. We'll meet the lady who could be carrying our baby. I can't believe it. When you come back, you'll have a baby. That is so weird. And so incorrect. (..)2004 TvShow: Friends Title: The One with the Birth Mother Season: 10 Episode 9