Some innate capacity - some part of the human genetic endowment - enters into language acquisition. That much is uncontroversial among those who believe that humans are part of the natural world. If it were not true, would be a miracle that my granddaughter reflexively identified some elements of the blooming buzzing confusion as language-related and went on to acquire capacities of the kind that you and I are now exercising, while her pet kitten (chimp, songbird, bee...), presented with exactly the same data, could not take the first step, let alone the later ones.