Colic is crying in babies lasting more than three hours for at least three days a week. Gas can occur anytime and resolves spontaneously by burping or other techniques. Gas can also cause colic in babies if not resolved. Babies can pass gas through burping or flatulence. Colic can also be due to other conditions, such as food allergies. If your baby is experiencing fussiness, discomfort, abdominal pain or ache, or any other symptoms and you are unsure about the cause, it is advisable to seek the opinion of a pediatrician.