Hey Mom a child activesness is the best fact to understand her daily routine. This could be considered as ideal. The average 6-year-old is about 45 inches tall and weighs approximately 22 to 26kgs. Your child will double that weight by the time she reaches adolescence and grow to five feet tall or more!. But you can check with her activities which help her to be more better and eat peacefully at once place. Include good protein which help her to gain weight.