Babies have been known to fuss and cry, especially during the first three months of life.

Colic is when an otherwise healthy baby cries or fusses frequently for no clear reason. It's defined as crying for more than 3 hours a day.

It may be due to digestion problems or a sensitivity to something in the baby's formula or that a nursing mom is eating. Or it might be from a baby trying to get used to the sights and sounds of being out in the world. Some colicky babies also have gas because they swallow so much air while crying.