Infant colic, commonly occurring in about 20% of babies, is defined as a condition in healthy infants under three months old who cry for at least three hours per day, at least three days per week. The symptoms of infant colic usually start between two to four weeks of age and improve by three to six months. To alleviate the symptoms, one can gently rub the baby's belly clockwise and use a holding position known as the "airplane hold." This involves holding the baby in a prone position, lying face down on the parent's hand, resembling the posture of flying in an airplane. The "airplane hold" mainly helps to relieve gastrointestinal gas and colic in babies, and it generally lasts for about 30 minutes.