Many infants cry at regular times of the day and are particularly difficult to soothe. Unexplained crying occurs in about 1 in 5 infants, usually from the second to the fourth week of life, peaking at about 3 hours per day at 6 weeks of age, usually between 6:00 pm and the early morning hours, and decreasing to 1-2 hours per day by 3-4 months of age. As long as the crying stops within a few hours and the infant is not uncomfortable for the rest of the day, this is not a cause for concern. Their crying is characterized by desperate crying, facial redness, kicking and stirring of the legs, curling of the legs into the abdomen, and exhaustion after crying. The infant’s stomach may swell up from the accumulation of gas. The crying may occur throughout the day and is usually worse in the evening. The cause of this phenomenon is unknown, but it is usually due to the infant’s sensitivity to stimuli or the immaturity of the nervous system, which is not self-regulating. As the infant grows older, this unregulated crying will improve. Usually the crying stops after 3 to 4 months of age, but rarely it can continue until 6 months of age. In breastfed infants, this crying may be a sign that the infant is sensitive to certain foods in the mother’s diet. And rarely is it caused by a sensitivity to protein in formula milk. The crying may be a sign of some disease, such as a hernia or other illness. Although you can only wait for the baby to stop crying on his own, there are steps you can take. The first step is, of course, to consult your pediatrician to rule out crying due to a serious medical condition, and then consult him about which of the following will help: if breastfeeding, you can try to remove dairy products, caffeine, onions, cabbage, and other potentially irritating foods from your own diet; if you are formula (artificial) feeding, consult your pediatrician about the need to use hydrolyzed protein formula. If the crying is caused by food sensitivities, the crying should decrease within a few days.