There is no 11-month baby development standard, 11-month baby development can be roughly analyzed from head circumference, length, weight, milk teeth, sensory development, motor development and other aspects, as follows: 1. head circumference: the head circumference of 11-month-old male babies is around 43cm to 49.5cm, and the head circumference of female babies is around 42cm to 48.3cm. 2. Length: The length of 11-month-old male babies is around 69cm to 83cm, and the length of female babies is around 67cm to 81cm. 3. Weight: 11-month-old male babies weigh around 7.59kg to 13kg, while female babies weigh around 7.2kg to 12.2kg. 4. Milk teeth: Milk teeth erupt gradually, and about 6 teeth can erupt at 11 months. 5. Sensory development: babies can see small objects, their range of vision is further expanded, they can distinguish different sounds, and they like toys that make sounds. 6. Motor development: can sit alone, crawl, help stand, etc., can play with toys upside down with both hands, can imitate simple vocabulary. 11 months baby’s development is multi-faceted, in addition to the above performance, will also be manifested in other. If your baby’s development is significantly later than that of babies of the same age, it is recommended that you seek prompt medical attention.