[Modification of the 2d sound during the first weeks of life].
D000367:Age Factors; D004562:Electrocardiography; D006321:Heart / Q000502:physiology; D006326:Heart Auscultation; D006347:Heart Sounds; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010701:Phonocardiography
Modificazioni del 2 tono durante le prime settimane di vita.