“…Despite its commonness, the cause of colic is still unknown, effective treatment is lacking and the criteria for defining colic are vague. The occurrence of colic in different studies varies between 3 and 40%, depending on the criteria on which the diagnosis is based (Cockington et al ., 1981; Thomas, 1981; Hide & Guyer, 1982; Ståhlberg, 1984; Lothe & Lindberg, 1989; Matheson et al ., 1989; Lester et al ., 1990; Lehtonen & Korvenranta, 1995; Canivet et al ., 1996). The clinical approach to infants and parents shows evidence of the ambiguities in the literature on colic and is dominated by trial and error (Wikander, 1995).…”