Whether an infant is drowsy or normal sleeper can be judged from whether the infant can be awakened or not, its development and accompanying symptoms. 1. Whether the baby can be woken up: if the baby is sleeping normally, it is still easy to be affected by external stimulation, but if the baby is sleepy, it is not easy to be affected by external stimulation, it is not easy to be woken up, and when it is woken up, it is also indifference and lack of spirit. 2. Development: If the baby is sleeping normally, the development is usually good. However, if they are drowsy, the sleepiness caused by this disease often leads to developmental abnormalities, such as abnormal length and weight development. 3. Accompanying symptoms: Infants are usually in good spirits and have a good appetite when they sleep normally. However, if the infant is not easy to be woken up, has poor mental state, poor appetite and indigestion, we should consider whether the sleepiness is caused by the disease. Infant sleepiness may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.