During substage babies repeat actions that result in exciting or pleasurable outcomes.

Substage 3

develops schematic ideas deliberate actions focus on repeating interesting effects direct imitation focused on self simple associations increased physical skills enable infant to handle materials more effectively

Activities included are 
reaches for and grasps objects, manipulates items repeats interesting or surprising actions copies another baby banging with a wooden spoon links objects by function sits and passes toy from one hand to the other