Colic: Doctors have yet to discover the causes of infant colic, described as excessive crying in an otherwise healthy baby. Symptoms and signs include clenching fists, arching the back, reddening of the face, passing gas, belching, and extending the legs. Treatment may involve administering simethicone drops, changing the baby's diet, trying an alternative formula, massaging the infant, rocking and swaddling the infant, and playing relaxing music.