Question
Although each child’s development standards are influenced by factors such as genetics, nutrition supply, and living environment, there is still a general range of development standards. What are the development indicators for a 21-month-old baby?
Answer
For a 21-month-old baby, the average height range for boys is typically between 79.4 to 92.5 centimeters, with a weight range of 9.7 to 14.8 kilograms; for girls, the height range is 78.3 to 91.1 centimeters, with a weight range of 9.1 to 14 kilograms. Additionally, the head circumference for male infants is approximately 48.83 centimeters, while for female infants it is about 47.67 centimeters. The chest circumference for male infants is around 49.89 centimeters, and for female infants it is approximately 48.84 centimeters. At this age, babies can walk steadily, and those with better motor skills can even run freely, squat for a short period, and climb up and down by holding a railing