Infant colic is the most common cause of abdominal pain in infants. It generally occurs most frequently in babies under three months old and is a common reason why babies cry and fuss, especially during the first month. Typically, babies suddenly start crying and becoming restless at night. This fussing is not directly related to hunger or illness and it's often difficult to soothe them. Sometimes, the baby's legs may contract, and the abdomen may also show contractions, along with symptoms of abdominal bloating. Gently massaging the baby's abdomen, particularly in a clockwise direction, can possibly alleviate the symptoms of abdominal pain.