The rule of threes: If crying goes on for more than 3 hours a day, over more than 3 days at a time and for more than 3 weeks, then an infant is ____.

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The "rule of threes" is often used to diagnose colic in infants, which is characterized by excessive crying that occurs for more than three hours a day, over more than three days at a time, and for more than three weeks. Option A, C, and D are not supported by the rule of threes.

The Rule of Threes: If Crying Goes on for More