Do infants think?
D000367:Age Factors; D001288:Attention; D001307:Auditory Perception; D002657:Child Development; D003071:Cognition; D005260:Female; D006339:Heart Rate; D006801:Humans; D007223:Infant; D008606:Mental Processes; D009048:Motor Skills; D013850:Thinking; D014796:Visual Perception