The most recent warning came last week when the American Academy of Pediatrics（儿科）for the first time included warnings about “second­hand television” in its guidelines for kids under age 2.

　　In addition to the time for young kids to watch TV，it warned against watching TV with them nearby，saying the practice hurt their language development.It pointed to several studies，including one that found background TV reduced the length of time children played and caused their focus on play to wander.Recent surveys find that about one of three families leave the TV on most of the time.

　　The warning said TV keeps young kids and their parents from interacting—a key way children develop the working vocabulary they'll need in school.“If you're trying to connect with your kids，you've got to turn the screens off，”says Ari Brown，a pediatrician and lead author on the recommendations.She worries that when the focus is on TV，there's less talk time.Brown discourages families from keeping the TV on when no one is watching and suggests they wait until very young kids are in bed before they watch

　　their favorite show.“Parents are distracted（分散注意力）by TV the same way preschoolers are，”says Lisa Guernsey，author of the 2007 book Into the Minds of Babies：How Screen Time Affects Children From Birth to Age Five.She says young children learn much more from face­to­face interaction than a screen.“They see someone who's able to do that as a true learning partner，”she says.“They don't have any way of knowing whether that character or face on screen really understands them.”

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