The range of height and weight widens. Height for boys and girls varies from 50 inches to 60 inches. Small muscles develop rapidly during this period. This development makes activities that require the use of those muscles, such as hammering or playing musical instruments, more enjoyable. Children in this age group are as coordinated as adults, although lapses of awkwardness are common.
Eyes reach maturity in both size and function.
Regular eye check-ups are an important part of annual physicals. Energy abounds and children this age may become over-stimulated when participating in competitive, physical activities. Regular dental check-ups are important during these years as permanent teeth shift position. Mental development Children in middle childhood can enjoy reading alone, can think abstractly and can plan ahead for several weeks. They can evaluate behavior with insight.