Unexplained crying occurs in about 1/5 of infants. Crying begins 2 to 4 weeks after delivery, occurs between 6 p.m. and midnight, and takes about 3 hours a day. It is characterized by inconsolable crying, stretching or stirring of the legs, and a bulging, gassy abdomen. When not crying, the child feeds and is in good spirits. The cause of this crying is unknown (called colic Colic). Parents do not need to panic. It usually gradually decreases and stops by 3 months. At the first attack, a doctor may be needed to rule out diseases such as intussusception or hernia. The cause of this colic is still unknown. One of the following methods may work. 1. Breastfeed the child and the mother does not eat irritating foods such as dairy products, chili peppers, coffee or onions. The colic stops after 1 to 2 days in infants who cry due to food allergies. 2, hold the baby walking and gently rocking, through rhythmic movement and body contact to help him fall asleep, but to avoid intense shaking the baby to avoid brain damage. 3. Wrap the child in a blanket to make him feel warm and safe. 4.Place the child’s abdomen on his knees and then gently rub his back. Pressure on the abdomen helps relieve pain. 5.If the how-to method does not stop the crying, you can let the baby cry for a while and fall asleep automatically.