Those who sing the praises of prekindergarten education might want to peruse Yale lecturer Erika Christakis’ article in the latest issue of The Atlantic.

Until recently, school-readiness skills weren’t high on anyone’s agenda, nor was the idea that the youngest learners might be disqualified from moving on to a subsequent stage. But now that kindergarten serves as a gatekeeper, not a welcome mat, to elementary school, concerns about school preparedness kick in earlier and earlier. A child who’s supposed to read by the end of kindergarten had better be getting ready in preschool. As a result, expectations that may arguably have been reasonable for 5- and 6-year-olds, such as being able to sit at a desk and complete a task using pencil and paper, are now directed at even younger children, who lack the motor skills and attention span to be successful.

Preschool classrooms have become increasingly fraught spaces, with teachers cajoling their charges to finish their “work” before they can go play. And yet, even as preschoolers are learning more pre-academic skills at earlier ages, I’ve heard many teachers say that they seem somehow—is it possible?—less inquisitive and less engaged than the kids of earlier generations. More children today seem to lack the language skills needed to retell a simple story or to use basic connecting words and prepositions. They can’t make a conceptual analogy between, say, the veins on a leaf and the veins in their own hands.

New research sounds a particularly disquieting note. A major evaluation of Tennessee’s publicly funded preschool system, published in September, found that although children who had attended preschool initially exhibited more “school readiness” skills when they entered kindergarten than did their non-preschool-attending peers, by the time they were in first grade their attitudes toward school were deteriorating. And by second grade they performed worse on tests measuring literacy, language, and math skills.