Physiological Changes
Myelinization of the brain is complete by age 7, and by age 12 the head has reached its adult size.
The bone continue to ossify and grow, and the body develope a lower center of geavity then in preschool years, due in part to a shift in posture and an increase in leg length.
Physical growth is slow during the school-age years until a growth spurt occurs just before puberty.
The average weight gain is 5.5 to 7 pounds (2.5 to 3.2kg) per year, and the average height increase per year is about 2 inches(5 cm).
Children who are taller then their peers may face an extra challenge, because they are likely to be treated as if they are older or more mature.
The self concept may suffer if the they are older or more mature.
The self concept may suffer if the tall child does not live up to these inflated expectations.