DefinitionHigh blood pressure (hypertension) is an increase in the force of blood against the arteries in the body. This article focuses on high blood pressure in infants.Alternative NamesHypertension - infantsCauses, incidence, and risk factorsBlood pressure measures how hard the heart is working, and how healthy the arteries are. There are two numbers in each blood pressure measurement:The first (top) number is the systolic blood pressure, which measures the force of blood released when the heart beats.The second (bottom) number is the diastolic pressure, which measures the pressure in the arteries when the heart is at rest.Blood pressure measurements are written this way: 120/80.Several factors affect blood pressure, including:HormonesThe health of the heart and blood vesselsThe health