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RE: Can Science Tell Us Right From Wrong?
Do we know why babies need love to survive? Not that I know of, but it is likely that there is a psychological and/or biological reason. My first guess would be that it has to do with hormones that are produced when others show affection that are necessary for a child's survival.
The first google result has some interesting perspectives related to hormones, oxytocin, body heat regulation, being calm, and brain development.