The following conditions are common in babies with poor sleep: 1. Vitamin D deficiency rickets. The baby is often sleepy, easily startled, night crying and other symptoms, after giving supplemental vitamin D and calcium, more outdoor activities in the sun, reasonable addition of complementary food, gradually will be improved. 2, sleep-dependent type. The parents often hold, shake or sleep with a pacifier when the baby falls asleep, the dependency habit formed in the long run, to gradually take desensitization, quit this habit. 3, difficult to raise type of temperament. Temperament is different for each person, can be divided into easy to raise type, intermediate type and difficult to raise type. Difficult to raise baby in the process of raising more difficult, often sleep restlessness, crying and other phenomena at night, you can go to the child health department to assess the determination of temperament, if necessary, to give early intervention.