Secular trend in physical growth
Changes in body size from one generation to the next
final height has been increasing for the past 150 tears due to improved nutrition and health
malocclusion
A condition in which the upper and lower teeth do not meet properly
one third of children suffer from this
obesity
A greater than 20 percent increase over healthy weight based on body mass index
has increased dramatically in industrialized and developing nations
Myopia
most common vision problem
nocturnal enuresis
Bedwetting during the night; heredity is major contributor to this, but early difficult temperament elevates risk for the problem
most effective treatment is a urine alarm
Rough and tumble play
A form of peer interaction involving friendly chasing and play-fighting that emerges in the preschool years and peaks in middle childhood. May have been important evolutionarily for development of fighting skill
dominance hierarchy
A stable ordering of group members that predicts who will win when conflict arises
