[Frequency and rhythm of heart contractions during sleep in infants].
D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012119:Respiration; D012890:Sleep
Chastota i ritm serdechnykh sokrashcheniĭ vo vremia sna u deteĭ do i roda.