Seven-month-old babies with unsteady head up belongs to the motor development delay, which is abnormal, mostly seen in craniocerebral diseases, cervical spine dysplasia, nutritional diseases and other pathological factors, need to be analyzed according to the condition. 1. Craniocerebral diseases: cerebral dysplasia, congenital cerebral dysplasia can lead to unsteady head; cerebral palsy, babies often have intrauterine hypoxia, history of difficult delivery, ischemic-hypoxic encephalopathy or kernicterus after birth, which may cause brain damage and unsteady head; craniocerebral tumor, due to compression of nerves leading to motor disorders, which can lead to unsteady head. 2. Cervical spine dysplasia: it will affect the mobility of baby’s cervical spine and cause head lifting disorder. 3. Nutritional diseases: such as malnutrition, calcium deficiency and other diseases, can lead to motor development disorders and unsteady head. There may be other reasons why a 7-month-old baby’s head is unsteady, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.