Lyric discussion by kalloween 

I don't believe this song is about abortion either. Well, maybe abort an aspect of oneself. I think that Baby Birch is a name the writer has given to an aspect of herself.

"I will never know you, and at the back of what we've done, there is that knowledge of you" =not understanding that part of the self or why she has made certain choices.

She goes back an forth saying "you" when addressing that part of the self and addressing an old lover.

"There is a blacksmith and there is a shepherd and there is a butcher boy...."= Poetic allusion to, what, I'm not sure.

"...Skinned her quick. held her there kicking and mewing....And then she ran, as they're liable to do"= Self-sabotage, that aspect of the writer was an emotional runner.

Basically my interpretation is: Self-sabotage/ Getting too close to someone emotionally and pulling away in fear/Abandoning that cowardly aspect of self which causes the self sabotage. Hope this made sense.

An error occured.