Colic, Rule of three

Wessel’s criteria (1954) is an outdated definition. The Wessel's criteria “define colic as paroxysms of irritability, fussing or crying lasting three hours or more per day on three days or more per week in any one week in an otherwise healthy infant aged two weeks to four months. Furthermore, it requires severe colicky infants to have paroxysms for more than three weeks” (Zeevenhooven et al. 2018); today the Rome IV criteria for colic apply.