One and a half year old baby dreaming and crying may be certain physiological phenomena, may also be the manifestation of certain diseases, such as rickets, eczema, etc., should be timely consultation to identify the cause. 1. Physiological factors: due to the baby’s excessive excitement before going to bed, the cerebral cortex is not immediately calmed down after going to sleep, thus the phenomenon of dreaming and crying. It may also be related to the accidental fright during the daytime, which may last until the baby sleeps at night. As the cerebral cortex still retains the memory, it can show the phenomenon of crying while dreaming. 2. Pathologic: (1) rickets, the symptoms are mainly symptoms of nerve excitation, such as irritability, crying, easy to scare, love sweating, etc. Sometimes there is also the manifestation of shaking the head, and clinically there can be occipital baldness, cranial softening and other symptoms. (2) eczema, the onset of the child’s skin will appear erythema, papules, papules, blisters and other lesions, often accompanied by intense itching, causing children to cry and irritability, poor appetite, sleep disturbance. In fact, any disease that causes pain, itching and other discomforts to the baby may cause the baby to dream and cry. Therefore, it is recommended that parents, if they exclude physiological causes, should bring their babies to the clinic in time, and ask the doctor to clarify the cause and give targeted treatment.