The project is to be carried out on the island of Funen, Denmark. Recruitment of babies with symptoms of infantile colic is based on contact by the parents of the babies to the project manager. Information about the existence of the study is given to health visitors, general practitioners, midwifes and to women who have given birth on the maternity ward in the University Hospital of Odense. For infants fulfilling the diagnostic criteria for colic the parents will register amount of crying using a valid instrument for at least three days before the first visit at the chiropractor Clinic (baseline registration). The babies will be randomized to chiropractic treatment or no treatment. The parents will be unaware of the child's allocation. All children have four visits during two weeks at the chiropractor. All children will be taken to the chiropractor's treatment room, while the parents stay in the reception areas. Before treatment, the chiropractors will note, whether they suspect musculoskeletal involvement or not. The parents register the amount of crying continuously during the two weeks and up to and including three days after the fourth visit. Three days after the the fourth visit, the parents are informed by the chiropractor about the child's allocation. Children in the control group will afterwards have the opportunity to have four free visits with chiropractic treatment.