Normal blood pressure in children: 50th to 90th percentiles

Age	Systolic pressure, mm Hg	Diastolic pressure, mm Hg
Birth, 12 hours, <1000 g	39-59	16-36
Birth, 12 hours, 3 kg	50-70	25-45
Neonate, 96 hours	60-90	20-60
Infant, 6 months	87-105	53-66
Toddler, 2 years	95-105	53-66
School age, 7 years	97-112	57-71
Adolescent, 15 years	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.

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Normal blood pressure in children: 50th to 90th percentiles