A 2-month-old first born male has a 1-month history of repet…
A 2-month-old first born male has a 1-month history of repetitive crying spells lasting for 3 to 4 hours per day on most days of the week. The crying starts and stops without obvious cause and usually occurs in the late evening hours. Feeding and bowel movements are reported to be normal by the parents. Examination shows a healthy afebrile infant whose weight and development are normal. Muscle tone and fontanelles are unremarkable. Which of the following is the most likely diagnosis?
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