When does the Mind start working?

Parents more often than non say that about their children that they will not start realizing the signifi contributece of things until they reaching a certain age. Does that mean that they need to wrap up enough experience before they apprise start drawing meaningful patterns in their brainiacs and form connections between things as suggested by Hume ?But, at the same time is this arguments base on to Descartes assertion I think, so I exist, which implies that the mind thinks intuitively, about itself, and thereby brings into existence the deduction of events around it and the connection between them through and through reason. Here lies a problem of what precedes which, or a circular tautology. If human minds do not start working until acquiring or becoming experienced, how are the wee experiences registered and translated as the basis for future ? fracture of the problem is however related to the disparate ways in which the mind can itself be defined. Is the essence of th e mind honest pure conscious awareness, as suggested by Descartes. Or is it a product of piecemeal evolution with the passage of time, as it experiences events and reflects upon them, to reach a level of awareness. It is however sooner 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.