ideal weight for 6 month 9 years old girl. what can I do to increase her weight

A. For a six month old child should be two times of the birth weight on a minimum of 3 kg more than whatever is on the higher side and for a nine year old child it should be somewhere around 26 to 28 kg depending upon what the height and a good diet and good physical activities only going to enhance the weight and growth of your child