Of course it matters. Has anyone - on either side of the debate - ever suggested otherwise? I'm guessing "no", so your point is more of a red herring, or perhaps a distraction.
I said "it" because at some point during gestation, the mother carries a ball of cells, without gender attributes or conscience or heart; at some other point, those traits have developed. "It" is the appropriate pronoun for something that is barely defined (let alone sentient).
Okay. I was think you had a different reason, so I admit that I misjudged what you wrote.
I think my comment still stands even if it doesn't apply to what you wrote, though.
When people want to distance themselves from moral treatment of others they tend to avoid proper pronouns and go to "it", "thing" etc.
In other words, based on the language people use in this debate, I would disagree with your statement "There are many pro-choice arguments which say that, no matter what's growing inside the mother. she has the right to decide whether it lives or dies." And I would add that people may have arguments for a why a mom should abort her fully healthy 12 week baby, but either they're not good ones or the mother will still not want to refer to the child as their baby.
Of course, you're free to post what and how you want, sans approval from me or anyone else here (but within the boundaries of the rules). I just saw this thread as disappointing. There are more effective ways to be aggressive about what you think or feel or want to discuss.
Wasn't trying to be aggressive. Not even of the passive persuasion.

I don't want to angry. I tend to be stupid when I'm angry and have to apologize.
And it is sooo so easy to get angry with this topic as I've already discovered.