When we are looking at child psychology we are looking particularly at the development and cognitive state of those under the age of adolescents. This is different than adult psychology as their cognitive functions have not fully developed and this must be taken into account when looking at their behaviors and reactions in their environment.
Habituation within children is the concept in which a child will become familiar with an object they will become bored with it and seek a new stimulating object. What this means is that children seek out new experiences and will not stick with old experiences. When a child is reinforced for seeking new experiences because the experience is pleasurable they will continue to do so.