Many infants are fussy in the evenings, but if the crying does not stop and gets worse throughout the day or night, it may be caused by colic (KOL-ik). Colic usually starts between 2 and 4 weeks of age. A baby may cry inconsolably or scream, extend or pull up his or her legs, and pass gas. The baby's stomach may be enlarged. Crying can occur anytime, although it often gets worse in the early evening.

Colic will likely improve or disappear by the age of 3 or 4 months. Doctors don't know why some babies get colic. Some breastfed babies may be sensitive to a food their mother eats, such as caffeine, chocolate, dairy, or nuts. Colic could be a sign of a medical problem, such as a hernia or some type of illness.

If your infant shows signs of colic, talk to your doctor. Sometimes changing what you eat can help. Some infants seem to be soothed by being held, “worn” with a baby wrap or sling, rocked, or swaddled (wrapped snugly in a blanket).

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source: http://www.womenshealth.gov