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©2013 UpToDate ® Print Email Normal blood pressure in children: 50th to 90th percentiles Age Systolic pressure, mm Hg Diastolic pressure, mm Hg Birth, 12 hr, <1000g 39-59 16-36 Birth, 12 hr, 3 kg 50-70 25-45 Neonate, 96 hr 60-90 20-60 Infant, 6 mo 87-105 53-66 Toddler, 2 yr 95-105 53-66 School age, 7 yr 97-112 57-71 Adolescent, 15 yr 112-128 66-88 The median (50th percentile) systolic blood pressure for children older than 1 year may be approximated by the following formula: 90 mm Hg + (2 x age in years). The lower limit (5th percentile) of systolic blood pressure can be estimated with this formula: 70mm Hg + (2 x age in years). A low systolic blood pressure should prompt an immediate evaluation for additional signs of inadequate perfusion, such as diminished mental status, prolonged capillary refill, and tachycardia. Data from: Vershold, H. Aortic blood pressure during the first 12 hours of life in infants with birth weight 610-4220 grms. Pediatrics 1981; 67:107 and Report of the second Task Force on Blood Pressure Control in Children--1987. Task Force on Blood Pressure Control in Children. National Heart, Lung, and Blood Institute, Bethesda, Maryland. Pediatrics 1987; 79:1.