Two-month-old babies cry at night and do not sleep more than the first, hunger, seen in newborns and babies within three months, when the need to nurse or through the feeding of milk to solve the problem. Secondly, calcium deficiency also tends to cause little babies to sleep restlessly. It is the preferred factor. Calcium deficiency causes increased excitation of the plant nerves in the brain, leading to night terrors, night waking and restlessness at night. You can give your baby calcium supplements or vitamin D and appropriate sunlight. Thirdly, if you cover your baby too hot at night, your baby will also wake up easily. You should reduce the number of small quilts you cover your child with. Fourth, bloating, which can occur in babies under one year old. If you eat too much before bedtime or drink milk without burping and exhausting, you will be awake due to bloating. You can give your child a digestive aid or give him/her an abdominal massage to promote exhaustion. Fifth, wanting to pee or already wet will also cause the child to cry. Sixth, too excited during the day or environmental changes. Out of the house sleep patterns change, give the baby do not play too much during the day, it is best to go to bed early at night. Seventh, teething or physical discomfort. It is recommended to go to the hospital for timely treatment.