There are individual differences in the height of 9-month-old babies, but generally speaking, the standard height range for male babies is 65.2-80.5cm, and the weight range is 6.67-12.99kg. The standard range for 9-month-old female babies is 63.7-78.9cm, and the weight range is 6.34-12.18kg. 9 months baby growth and development state is different, babies at birth development state is also different, plus feeding after birth and the child’s digestive and absorption function of the differences and diet will also have a great impact, if the dietary arrangements and nutritional allocation is not appropriate, will affect the physical health of the child. Although there are individual differences, but usually 9 months of male baby standard height range is 65.2-80.5cm, weight range is 6.67-12.99kg. 9 months of female baby height standard range is 63.7-78.9cm, weight range is 6.34-12.18kg. If the height of a 9-month-old baby obviously deviates from the standard, it is recommended to consult a doctor in time to identify the cause of the disease and actively intervene or treat it.