The height and weight of a normal child can be calculated and assessed according to different age groups. The average height of an 8-year-old boy is about 128cm and the normal weight is about 25.5kg.
There are differences in the way height and weight are calculated for different children. the formula for estimating the weight of a normal child is 7-12 years old, weight (kg) = [age (years) x 7-5]/2. the formula for estimating the height of a normal child is 7-10 years old, height (cm) = age (years) x 6+80. therefore, the average height of an 8 year old boy is roughly 128cm, and his weight is 25.5kg.
The height and weight of a child at the same age can fluctuate due to different factors such as genetics, nutrition and environment. Currently, according to the relevant definition, within plus or minus 10% of the standard height or weight is considered normal.
The age group of 8 years old belongs to the child’s school age, this stage is the key stage of growth and intellectual development, so in this stage the child’s height and weight will be rapid development, need to pay attention to a balanced diet, and actively participate in sports, and to ensure that sufficient sleep.