title: Study of cardiac rhythm in healthy newborn infants.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000175:diagnosis*; D012848:Sinoatrial Block / Q000175:diagnosis*; D013610:Tachycardia / Q000175:diagnosis*