Paroxymal, often inconsolable, episodes of distressed crying, usually later in the day, in infants between 2 weeks and 4 months. It is a diagnosis of exclusion, usually once other conditions have been excluded on history. The aetiology of colic is not entirely clear and despite the name, a gastrointestinal cause is not certain. An organic cause identified only in a small percentage of cases. Outside of the 'colicky' periods, the baby will feed well and will be gaining weight appropriately.