A normal blood pressure for a 2 1/2-year-old ranges from 84/39 to 117/71 mmHg in males and 85/43 to 116/72 mmHg in females, states the National Heart, Lung, and Blood Institute. The height percentile of an individual child is required when determining his normal blood pressure range.
After a doctor measures a child's blood pressure, the result is classified in a certain percentile. For instance, if a 2-year-old male in the 50th percentile for height has a blood pressure of 102/57, his blood pressure is classified in the 90th percentile, notes the National Heart, Lung, and Blood Institute.
High blood pressure in children is a growing problem that leads to serious health consequences, including heart disease and stroke, explains WebMD.