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

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This is known as the "rule of threes" for colic, meaning if a baby cries for more than three hours a day, for more than three days per week, and for more than three weeks in a row, they may be diagnosed with colic.

The Rules of Threes: If the Crying Goes on for More