WHAT IS IT like to be a baby? For centuries, this question would have seemed absurd: behind that adorable facade was a mostly empty head. A baby, after all, is missing most of the capabilities that define the human mind, such as language and the ability to reason. Rene Descartes argued that the young child was entirely bound by sensation, hopelessly trapped in the confusing rush of the here and now. A newborn, in this sense, is just a lump of need, a bundle of reflexes that can only eat and cry. To think like a baby is to not think at all. Modern science has largely agreed, spending decades outlining all the things that babies couldn’t do because their brains had yet to develop. They were unable to focus, delay gratification, or even express their desires. The Princeton philosopher Peter Singer famously suggested that “killing a disabled infant is not morally equivalent to killing a person. Very often it is not wrong at all.” Now, however, scientists have begun to dramatically revise their concept of a baby’s mind.
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