There is no absolute standard for the development of eight-month-old babies, which can be reflected in height, weight, motor control, operation and language. The specific analysis is as follows. 1. Height: 8-month-old male babies are between 65.7 centimeters and 76.3 centimeters. The height of female babies ranges from 63.7 to 74.5 centimeters. 2. Weight: The normal standard of weight for 8-month-old male babies is between 6.9 kg and 10.8 kg, and that for female babies is between 6.3 kg and 10.1 kg. 2. Motor control: they can crawl, sit on their own for a long time, and stand up on their own by holding onto the railings. 3. Manipulation: hands can pass toys. 4. Language: can understand and repeat simple words. The development of an eight-month-old baby is multifaceted and will manifest itself in other ways besides the above. There is no absolute standard. However, if the baby’s development is significantly later than that of babies of the same age, it is recommended to seek timely medical attention.