Child-development experts have different names for the dyadic signaling system between adult and child, which builds the basic architecture of the brain. Jack P. Shonkoff, a pediatrician and the director of Harvard’s Center on the Developing Child, calls it the “serve and return” style of communication; the psychologists Kathy Hirsh-Pasek and Roberta Michnick Golinkoff describe a “conversational duet.” The vocal patterns parents everywhere tend to adopt during exchanges with infants and toddlers are marked by a higher-pitched tone, simplified grammar, and engaged, exaggerated enthusiasm. Though this talk is cloying to adult observers, babies can’t get enough of it. Not only that: One study showed that infants exposed to this interactive, emotionally responsive speech style at 11 months and 14 months knew twice as many words at age 2 as ones who weren’t exposed to it.Child development is relational, which is why, in one experiment, nine-month-old babies who received a few hours of Mandarin instruction from a live human could isolate specific phonetic elements in the language while another group of babies who received the exact same instruction via video could not. According to Hirsh-Pasek, a professor at Temple University and a senior fellow at the Brookings Institution, more and more studies are confirming the importance of conversation. “Language is the single best predictor of school achievement,” she told me, “and the key to strong language skills are those back-and-forth fluent conversations between young children and adults.”
It has never been easy to balance adults’ and children’s needs, much less their desires, and it’s naive to imagine that children could ever be the unwavering center of parental attention. Parents have always left kids to entertain themselves at times—“messing about in boats,” in a memorable phrase from The Wind in the Willows, or just lounging aimlessly in playpens. In some respects, 21st-century children’s screen time is not very different from the mother’s helpers every generation of adults has relied on to keep children occupied. When parents lack playpens, real or proverbial, mayhem is rarely far behind. Caroline Fraser’s recent biography of Laura Ingalls Wilder, the author of Little House on the Prairie, describes the exceptionally ad hoc parenting style of 19th-century frontier parents, who stashed babies on the open doors of ovens for warmth and otherwise left them vulnerable to “all manner of accidents as their mothers tried to cope with competing responsibilities.” Wilder herself recounted a variety of near-calamities with her young daughter, Rose; at one point she looked up from her chores to see a pair of riding ponies leaping over the toddler’s head.
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