what causes colic

Colic is a condition characterized by frequent, prolonged, and intense crying or fussiness in a healthy infant. The exact cause of colic is unknown, but there are several theories. It may be due to digestion problems, a sensitivity to something in the baby's formula or something that a nursing mom is eating, or the baby's immature digestive system. Other possible contributing factors include an imbalance of healthy bacteria in the digestive tract, food allergies, or the baby's sensitivity and trouble adjusting to the world. Some people also think that gas may be to blame for colic, but there isn't much proof to support this. Colic typically starts within the first few weeks after birth, peaks between 4 and 6 weeks of age, and usually ends when the baby is 3 to 4 months old