Typically, the attacks start in the evening when you may be most tired and your patience thin. Take comfort, though. Colic is rarely dangerous and doesn't last a long time. It usually begins after an infant is two weeks sold, peaks at about three months of age and most often ends by the fourth month. The cause of colic is a mystery.
Some pediatricians think it is due to an underdeveloped digestive tract.
Others blame food allergies, abdominal gas, not enough sleep or over-sensitivity to a busy and noisy home. Still others think it is a combination of these factors. An attack of colic may end with the passage of gas or stool. Once in a while, colic may be an early sign of a serious medical problem. For example, in the medical condition called intussusception, the bowel becomes obstructed.