Originally posted by Starlight
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As I said, my criteria of interest is the level of cognition of the fetus/infant, and a useful comparison is how it compares to animals. If it's less-aware than the animals that we kill on a regular basis, then I don't overly object to it's killing. But if it's more aware than even the most intelligent animal, then I would object.
While I'm not a biologist, my understanding of the basics of the situation, is that the human fetus stays mentally under-developed compared to most animals right up until birth. This is because humans walk upright rather than on all fours which causes the human birth canal to be a lot narrower than in most animals. A lot of animals are born pretty much fully-functioning, as their brains develop extensively in the womb. However the human baby's brain gets squeezed a lot as it travels through the much narrower birth canal, which would cause substantial brain-damage if there brain were already developed, so instead the brain undergoes very little development in the womb and develops almost entirely post-birth, with the result that human babies are utterly unable to fend for themselves when first born, unlike many animal babies. As a result, human babies are born with a cognitive level far lower than most animals. Extensive brain development then occurs in the age range 1-4 years old. Almost nobody has even a single memory from when they were younger than about the age of 3. During this period of rapid cognitive development, the baby increasingly gains cognitive capability bringing it on par with various animals, and then beyond them.
So if I had to give a clear answer I'd say age range 1-4. As such, I've got no inherent objection to post-birth-abortion / infanticide / call it whatever you will in the first couple of months after birth if there is some sort of good reason for it. If I was writing a law, I would probably want to draw the line in the sand at 3 months post-birth, as beyond that there's probably enough cognitive development beginning to occur that we're headed into gray areas, and there doesn't seem likely to be any medical motivations to want to explore those gray areas further.
While I'm not a biologist, my understanding of the basics of the situation, is that the human fetus stays mentally under-developed compared to most animals right up until birth. This is because humans walk upright rather than on all fours which causes the human birth canal to be a lot narrower than in most animals. A lot of animals are born pretty much fully-functioning, as their brains develop extensively in the womb. However the human baby's brain gets squeezed a lot as it travels through the much narrower birth canal, which would cause substantial brain-damage if there brain were already developed, so instead the brain undergoes very little development in the womb and develops almost entirely post-birth, with the result that human babies are utterly unable to fend for themselves when first born, unlike many animal babies. As a result, human babies are born with a cognitive level far lower than most animals. Extensive brain development then occurs in the age range 1-4 years old. Almost nobody has even a single memory from when they were younger than about the age of 3. During this period of rapid cognitive development, the baby increasingly gains cognitive capability bringing it on par with various animals, and then beyond them.
So if I had to give a clear answer I'd say age range 1-4. As such, I've got no inherent objection to post-birth-abortion / infanticide / call it whatever you will in the first couple of months after birth if there is some sort of good reason for it. If I was writing a law, I would probably want to draw the line in the sand at 3 months post-birth, as beyond that there's probably enough cognitive development beginning to occur that we're headed into gray areas, and there doesn't seem likely to be any medical motivations to want to explore those gray areas further.
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