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It may be a new school year, yet I come to sing the praises of trampolines and bubble-blowing, pillow forts and peekaboo, Monopoly and Marco Polo.

 in the journal Pediatrics summarizes the evidence for letting kids let loose. "Play is not frivolous," the paper insists, twice. "It is brain building." The authors — Michael Yogman, Andrew Garner, Jeffrey Hutchinson, Kathy Hirsh-Pasek and Roberta Michnick Golinkoff — ask pediatricians to take an active role by writing a "prescription for play" for their young patients in the first two years of life.

"Play is disappearing," says Hirsh-Pasek, a developmental psychologist who is a professor at Temple University and a senior fellow at the Brookings Institution. By targeting doctors, she explains, the paper hopes to build on the success of a literacy initiative called Reach Out and Read. That program reaches nearly 5 million children annually by giving out children's books 

 "You have an opportunity there" to change behavior, she says.

It's a sign that "we're living in different times," comments Anthony DeBenedet, a doctor, and co-author of The Art of Roughhousing and the author of Playful Intelligence, who was not involved in the paper. But he calls the article "beautiful" in the way it marshals the hard evidence in favor of climbing trees and talking on banana phones.

Play is, by definition, intrinsically motivated. People and many animals do it just because. But apparently parents and teachers these days need more of a nudge than that to make the space for play. So here are some of the research findings that appear in the paper.

1) Play is essential for healthy brain development

In order to grow and develop healthy connections, our brains need plenty of something called brain-derived neurotrophic factor, or BDNF. This paper cites 

 what happened when young rats were allowed to tussle and tumble together. Half an hour of this kind of play actually changed the expression of their genes in a way that promoted the production of BDNF.

2) Play reduces obesity and associated diseases

Toddlers with plenty of chances to run, jump and climb grow into kids who are physically confident and more likely to be active and healthy adults. 

 in this paper looked at children in Head Start preschools, which serve low-income communities. The young ones who got at least an hour a day of outdoor play showed significant improvement in their body mass indexes. Those who got the most outdoor time were 42 percent less likely to be overweight by the end of the year, with positive associations strongest among children who grew up in the least-safe neighborhoods.

3) Play helps children manage stress and even recover from trauma

This is an emerging area, and "we need much more research," says Hirsh-Pasek. The paper cites animal studies, as well as a study of a yearlong intervention in a preschool. Young children with disruptive behavior were assigned to play regularly, one-on-one with a teacher, with the adult letting the child take the lead. This is an approach known as "banking time," as in storing up warm, relationship-building moments. Compared to a control group, the children showed improved behavior and reduced cortisol, a stress hormone.

Continuing with the theme of banking time, play is also important for building relationships between parents or other caregivers and kids, Hirsh-Pasek points out. "The conversations with kids that come out in play are brain-builders." And play encourages 

 — getting on the same page, feelings-wise — which in turn can help children learn to regulate their emotions when the cookie crumbles.

No, everything doesn't have to be about test scores! But play is also good for test scores, says Hirsh-Pasek. This paper argues that at tender ages, improvisational pretend-play, not direct instruction, is what really feeds both language development and general knowledge, not to mention, again, kids' intrinsic motivation. Hirsh-Pasek suggests that parents start small.

"Playing with blocks for even two minutes helps you use words together. It builds greater STEM learning skills. And I think it benefits parents, too!"

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The nation's doctors are being enlisted in a new fight: reclaiming children's right to play. A research paper urges pediatricians to prescribe playtime.

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