Your scepticism is irrelevant to me, as is your assertion about infanticide being primarily targeted at girls, since what I'm talking about took place thousands of years before patriarchy. My research and my story are based in anthropology and primatology. Fact: humans are a highly social species that survived through alloparental care (at a time, I might add, when gatherers provided more of the average daily calories than hunters did - something I spoke to in the OP). When mothers don't have that group support, the natural (evolutionary) instinct is to decline to raise offspring in that environment.
It is entirely appropriate to equate this with a current abortion discussion because this is exactly what is being demanded of women today. Overwhelmingly, women who seek abortions want them because they do not have the resources to care for yet another child. We are not only burdening women, but are forcing children to be born into situations where they do not have the support and care that they require (and have needed throughout human history) to thrive. And yet this is seen as somehow moral?
Obviously, there are other ways to avoid this situation, but since those are also being ignored, and legislators want to instead punish women and children rather than offer supportive environments, I think a little history lesson in the importance of social support is in order.
How about we draw moral lessons from all the women who are going to die from interfering in their personal medical decisions about things like ectopic pregnancies, and sepsis, and incomplete miscarriages? About all the women who are going to die from self-induced terminations of pregnancies that they are not in a position to sustain? About all the children who are going to grow up without the vital social supports that human beings as a species need so desperately that Paleolithic (and later) mothers would rather see their offspring die than attempt to raise them under those conditions. Did you miss the part about the 18th century? No one is advocating for child deaths - quite the opposite. I'm advocating for a culture that treats mothers and children with respect and the sort of social supports they both need in order to have a healthy society. If that wasn't obvious to you, it's because your emotions and not your brain were in the driver's seat.
Go back a reread this piece before making any further ill-conceived comments.