The result shows that(1) 2-year-old children display a self-controlled ability to delay satisfication,but there is great difference among individuals.

Study on maternal consciousness of 3-year-old children s mothers between China and Japan;

Behavioral representations of 119 7-year-old children (42boys, 77girls) in 3 helping situations (looking for the key; help experimenter carry table; comfort experimenter for injured feet) were observed.

A Correlational Research on Delaying Self-control of 2-year-olds and Their Family Factors;