What Whyohwhy said.
I think the extent to which posters are engaging in moral dissonance, tying themselves in knots to avoid even the most minor infringement on bodily autonomy (blood donation) that might affect men, in order to save lives, while insisting that women should suffer through a profound, non-consensual violation in order to save a foetus, is very telling.
I mean, pro-lifers will say they're against all abortion because all lives are precious, and advocate ferociously for foetuses, but then many of them are also in favour of policies that cause avoidable suffering to born children. They say they care about children, and they may even believe they do, but anti-abortion arguments for the most part are held by people who also have very little value for born lives, and certainly wouldn't be in favour of enforced blood and bone marrow donation, because ultimately it's not about 'saving lives' it's about controlling women's bodies.
This is similar, but to a less extreme extent.
I'm engaging honestly, but it's difficult to engage with people who refuse to acknowledge that their own motivations appear morally dissonant, and point to an origin in patriarchal views. I've put forward many sincere points and questions, and I've tried to answer everyone else's fully and seriously, but frankly, not many people are returning the favour and answering my points. I'm not sure why not.
As for the difference between infanticide at birth and feticide - personally I think the approach in both cases should be focused on a health approach, and prevention.
A woman who does such a thing, when she has access to abortion earlier on, is clearly extremely vulnerable or disordered - due to abuse, personality disorders, addiction, or other mental health issues, and needs help to ensure it doesn't happen again - but she's also not generally going to be a danger to anyone else but herself, and future pregnancies. So criminalising her seems unnecessary.