These domains are not really separate. A baby explores the world with her mouth hands and whole body. She uses her emerging motor skills to play with whatever she finds intersting. Her cognitive understanding of what an object is and how it can behave is based on what she can do with it. But it is also influenced by her interaction with adults who may offer her objects to explore or take them away so she won't get hurt,name objects and demonstrate their use, and reinforce her sense of self and her willingness to learn by clapping when she shakes the rattle or puts one block on top of another.