There is a certain "logic" to it... it only seems illogical if you assume their goal is to reduce fetal deaths. That's not what they're trying to do, though. If it were, there are countless things they could be cooperating with liberals on that could do that: better funding for neonatal care, confirming contraception access under Affordable Care, policies to fight obesity and smoking (which lead to higher rates of miscarriage), and so on. Instead, the goal here is simply to punish women who run afoul of their religion's sexual taboos. They are trying to make unwanted births an unavoidable risk of sex, so that women who have sex without actually wanting a child suffer for it.
If you ever doubt this is about sexual taboos rather than fetal lives, just think of it in terms of which issues you tend to see together. If it were about fetal lives, you'd tend to see that the same people who want abortion outlawed are also fighting the hardest to make sure employer-provided insurance covers contraception, and that there is excellent and affordable prenatal care, and so on. Instead, the people who want abortion outlawed are also generally those who don't like pornography, and gay marriage, and frank sex education in schools, and contraception, and transgender rights, and so on. There's no reason those issues should cluster together like that, except for the fact they're all driven by religious taboos around sex.
