What babies know, and noises parents make.
D000161:Acoustic Stimulation; D000818:Animals; D001519:Behavior / Q000502:physiology*; D003213:Conditioning, Psychological / Q000502:physiology; D006801:Humans; D007231:Infant, Newborn / Q000502:physiology*; D009622:Noise; D010290:Parents; D051381:Rats