When will it stop? Colic that has no diagnosed medical cause begins around two weeks of age and reaches its peak around six to eight weeks. Seldom do the outbursts continue longer than four months of age, but fussy behavior may last throughout the first year and mellow between one to two years of age. In one study of fifty colicky babies, the evening colic disappeared by four months in all the infants. What’s magic about four months? Around that time, babies develop more internal organization of their sleeping patterns. Other exciting developmental changes also lead babies to the promised land of fuss-free living: They can see clearly across the room. Babies are so delighted by the visual attractions that they forget to fuss. Next, they can play with their hands and engage in self-soothing finger sucking. Babies can enjoy more freedom to wave their limbs free-style and blow off steam. Also, after the first several months, a baby’s intestine is more mature and milk allergies may subside. Or, by this time the cause has been found or comforting techniques perfected.