The criteria often applied in colic diagnosis are called Wessel Rules or "Rule of 3" and are based on three simple and precise criteria:

  1. Crying at last more than 3 hours a day.
  2. More than three days a week.
  3. More than three weeks in a healthy and properly fed baby.

Moreover, there are some other characteristic symptoms that can help differentiate an episode of colic from a "normal" crying.

Inconsolable crying for more than three hours a day, three days a week and at least three weeks.

Baby with signs of anxiety and tension shown by a generalized tonic contraction.

Red face due to a prolonged duration of crying and total inability to be comforted.

Legs bent on the abdomen is a characteristic gesture in babies who suffer from colic

Bloating: the baby has a swollen belly and more gas than usual.

Important recommendation:

If the baby has other symptoms than the above, such as diarrhea, fever or vomiting, you should see a specialist. It may be a more serious problem.