If the birth mother does the right thing by placing the baby for adoption why punish her? I’m not seeing any upside.
I don't know about the rates of repeat "accidental" pregnancies leading to adoption. But in abortion there's the alarming fact that over half (I think it's 56%) of all abortions in the U.S. are done in mothers who had a prior abortion. Evidently the biological mother didn't learn the lesson the first time -- because the hardship of the decision to make the baby was put onto the baby (the one aborted) not on the two who made the baby.
I'm not proposing "punishing" anybody. The natural law of consequences for making babies is the burden of raising them. The past half a century of the welfare state and abortion has created a false experience of no consequences for bad decisions. Sometimes the word for this is "enabling". This has led to an increase in "accidental" pregnancies. I don't want a massive program of adoption to result in the same problem of enabling many future "accidental" pregnancies that the massive abortion system has done.
I'm saying whatever the solution for the immediate problem is (I'm with you on adoption solving the immediate problem of who's gonna raise the baby) needs to be a solution that doesn't encourage the biological parents and others like them to make future babies willy nilly. All that will do is create more babies for us sensible people to have to figure out what to do with. But if the burden of raising babies is put back onto the people making the babies (like it was in all of history until the relatively new welfare state and abortion epidemic), the rate of "accidental" pregnancies will go back down to what it used to be and there will be less future babies for us sensible people to have to figure out what to do with.