Why children are ashamed?

The feeling of modesty wakes up in the boys about five years. Suddenly, are ashamed of their own nakedness and do not want to be seen without clothes. not even by their parents or siblings.

This is a normal phase, which means that it has reached a certain level of evolution: it is now recognized himself as a person separate and distinct from the others and can imagine how they see the others.

In addition, feels his own body and wants to decide who may look or touch. During, we must respect his modesty, not to mock him or force him to appear naked against his will.
Usually something passenger, forwards after a few years and reappears at puberty.