Why do we spend what makes up almost 20 per cent of our life being children? What is the purpose of our incredibly drawn-out pregnancies and post-birth investment into our offspring? These are just some of the questions addressed by the biological anthropologist Brenna Hassett in her second book, Growing Up Human, a scrupulous and entertaining dive into the unique evolution of human childhood.
Humans’ peculiar Neverland-like life plan is summarised by the author early on: ‘We, alone among the animals, have decided that not only do we want to live forever, we want to be forever young.’ Hassett lays out the wider evolutionary context for this by looking at the way other animals gestate and care for the next generation with striking examples, from a common rat to an orangutan, that are incomparable to the immense amounts of time, energy and resources humans invest into producing their incredibly demanding and helpless infants. The book proceeds to shed light on such aspects of our evolution as the development of pair bonds and monogamy, notions that are otherwise rare in the rest of the animal kingdom. It all circles back to how needy and helpless human babies are.
The obstetric dilemma at the heart of all this – essentially that upright walking (bipedalism) comes at a cost, as a smaller pelvis creates far from ideal conditions for giving birth to an increasingly larger brain – might not be new. But the book’s eye-opening contribution comes in its focus on the way we as humans have manipulated such given biological parameters and tweaked the basic aspect of our life-history strategy.
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