When does the Mind start working?

Parents generally say that about their children that they will non start realizing the significance of things until they tally a certain age. Does that mean that they pick up to accumulate enough experience before they can start muster meaningful patterns in their perspicacitys and form connections between things as suggested by Hume ?But, at the same time is this arguments based on to Descartes assertion I think, so I exist, which implies that the mind thinks intuitively, about itself, and thereby brings into world the significance of events around it and the connection between them through reason. Here lies a problem of what precedes which, or a circular tautology. If human minds do not start working until getting or becoming experienced, how are the archaeozoic experiences registered and translated as the basis for future ?Part of the problem is however relate to the different ways in which the mind can itself be defined. Is the nucleus of the mind just pure conscious aw areness, as suggested by Descartes. Or is it a product of gradual evolution with the passage of time, as it experiences events and reflects upon them, to reach a level of awareness. It is however quite possible, that the mind that Descartes describes is different from the mind that Hume describes when he says, All inferences from experience, therefore, are effects of custom, not of reasoning.