Iron Needs for Children Calculator

Babies are born with iron stores that last about 6 months. After that, breast milk alone does not provide enough iron (breast milk is low in iron, even though it is well-absorbed). At 7–12 months, babies need 11 mg/day — the highest requirement relative to body size across the entire lifespan. Iron-fortified cereals, pureed meats, and lentils are critical at this stage.

Plant foods contain non-heme iron, which is absorbed at a rate of 2–20% depending on the rest of the diet. Meat contains heme iron, which is absorbed at 15–35% and is unaffected by other foods. The Institute of Medicine recommends that vegetarians consume 1.8× the standard RDA to compensate for lower absorption. Calcium, tannins (in tea), and phytates (in whole grains) further inhibit non-heme absorption.

Iron deficiency (even before anaemia develops) causes: fatigue, pale skin, poor appetite, irritability, difficulty concentrating, frequent infections, and pica (craving non-food items like dirt or ice chips). Severe iron-deficiency anaemia in infancy can impair cognitive development and motor skills — effects that may persist even after iron levels are restored.

Vitamin C dramatically increases non-heme iron absorption — sometimes 3–6× more. Offer plant iron foods alongside vitamin C sources: citrus fruits, strawberries, kiwi, bell peppers, or broccoli. Avoid giving milk, tea, or calcium-rich foods at the same meal as iron-rich foods, as calcium competes for absorption.

The AAP recommends 1 mg/kg/day of iron supplementation for exclusively breastfed infants from 4 months until iron-rich foods are established. Premature babies may need even earlier supplementation. Do not supplement without guidance — excess iron is harmful. Always consult your pediatrician before starting any iron supplement.

The best iron sources for young babies are: iron-fortified single-grain cereals (rice, oat), pureed beef or chicken, pureed lentils, and pureed peas. By 8–10 months, soft-cooked meat pieces, egg yolk, and well-mashed beans are great options. Introduce red meat early — it provides the most bioavailable heme iron.