Colicky Baby Assessment View Calculator It is not unusual for a baby with colic to cry for 3 hours a day, several days a week. Experts are not sure what causes colic, which begins at about 2 weeks old. Fortunately, colic goes away as the baby matures and is normally gone by about 3 or 4 month old. Colic can be exhausting and emotionally draining for parents. If you ever feel yourself losing control, get help or take a minute to calm down. Never shake a baby. Shaking a baby out of frustration can cause permanent brain damage or death. (See our Shaken Baby Syndrome Assessment.) Take this quick assessment to learn more about the symptoms of a colicky baby and help you determine whether or not your baby might be suffering from colic. Learn more about putting this calculator or other calculators on your website.