Last year, when my son started kindergarten, my mom friends warned me that he might come home irritable the first few weeks. They were right: My normally happy-go-lucky five-year-old would trudge off the bus, throw his backpack on the entryway floor, and turn on the TV without a word (except to demand a bowl of Goldfish). When I asked about his day at dinner or at bedtime, he’d shut me down and change the subject.

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