Human babies seem pretty immoral/selfish and definitely don't know right from wrong -- I remember you saying something about that and I agreed with it, can you expand on that?

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Sure. For one thing, humans have a higher brain/body ratio (i.e. the amount of stuff in the brain is higher than the amount of stuff in the body). That means it's easier for the brain to be bigger and do more stuff.

We can say something similar about most animals: it takes a lot of meat to support a large, active brain. It is much easier for an animal to go through a lot of food at a high caloric cost than to maintain its brain weight while eating less than that cost. So brains get bigger and bigger at a slower and slower rate, so it takes a very long time to get a huge one (compared to mammals that typically start reproducing at 3 months).

An animal with a large brain also needs a lot of body to support it, because much of the brain is not used for processing sensory information. We know that the more brains an animal can support, the more senses it can use and the more its cognitive abilities can grow. So our ancestors may have made the trade-off that bigger brains came at higher caloric costs because, in an environment with low food abundance, they needed to make up for that increased energetic cost in more food, which meant producing fewer babies.

This trade-off still exists, though it is less strong now that we can get food from the supermarket, and an individual has the choice of how many offspring it wants. Humans are not especially good at being selective about which offspring to keep; we may make trade-offs by favoring the ones we can see more clearly ("we can look at their face"), or we may not (and that's where the "selfish" bit comes in). When we look at babies and feel "immoral" feelings toward them, that's an instinctual, hard-to-explain thing that may come from a variety of causes, some of which could be different in other animals.

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