All children need regular sources of iron-rich food, especially during later infancy, toddlerhood, teenage girls and for those following vegetarian or vegan diets. Iron availability from food is variable, and absorption in the intestine is limited to around 15-20%. Iron absorption depends on a number of changing factors: the iron status within the body, general health. Iron absorption generally decreases with age. The availability of iron within food is known as bioavailability. We depend on dietary iron to make haemoglobin, the oxygen-carrying molecule found in our red blood cells. Delivery of oxygen to the body, muscle and brain is its most important role in the body, but also for brain development, concentration and stamina. Vegan infants, children and teenage girls will need an iron supplement; but it’s also good to be aware of the natural rich sources, foods fortified with iron and factor affecting its absorption.