Breast milk is the ideal food for babies in many ways, but it contains little iron. Babies are born with stored iron that lasts a few months, and after that they need iron from somewhere else.

The short version

  • Birth to about 6 months: most full-term babies have enough iron stored from pregnancy, according to the CDC.
  • By about 6 months: babies need iron beyond breast milk, from iron-rich foods, iron-fortified cereal, or iron drops.
  • Breastfed babies and drops: the American Academy of Pediatrics (AAP) has recommended iron drops starting at 4 months for babies who get only or mostly breast milk, until they’re eating iron-rich foods. Ask your pediatrician at the 4-month visit.
  • Formula-fed babies on iron-fortified formula don’t need iron drops.
  • Preterm babies need extra iron sooner.
  • Keep drops away from children and give only the dose your pediatrician recommends.

Why babies need iron

Iron helps make hemoglobin, which carries oxygen through the body, and it supports brain development during infancy and early childhood, according to the CDC.

Iron deficiency in infancy can cause problems with attention and social development, and some of those effects may not be reversible, according to the NIH. It’s also linked to higher lead levels in the blood.

How long your baby’s iron stores last

Most full-term babies have enough stored iron for about the first 6 months. How much they start with depends on three things, according to the CDC:

  • How far along the pregnancy was. Babies born early have smaller stores.
  • Your iron level during pregnancy. See Iron in Pregnancy.
  • When the umbilical cord was clamped. A short delay lets more iron-rich blood reach your baby. See Delayed Cord Clamping.

How much iron babies need

Age Daily need
Birth to 6 months 0.27 mg (the amount in breast milk)
7 to 12 months 11 mg
1 to 3 years 7 mg

Source: NIH. The jump at 7 months is why iron-rich foods matter so much once your baby starts solids.

Who needs iron drops

Your baby What’s recommended
Full-term, getting only or mostly breast milk The AAP has recommended 1 mg of iron per kilogram of body weight a day, starting at 4 months, until your baby eats iron-containing foods such as fortified cereal. The CDC advises talking with your baby’s provider about whether iron drops are needed in the first 6 months and after.
Full-term, on iron-fortified formula No iron drops needed, according to the CDC. Standard iron-fortified formula can meet a baby’s iron needs for the first year, according to the NIH.
Born early, getting breast milk The AAP has recommended 2 mg per kilogram a day from 1 month to 12 months. Your baby’s care team will guide this.

Sources: CDC; NIH, summarizing the AAP’s clinical report.

Why your pediatrician should set the dose. The dose depends on your baby’s weight, whether your baby was born early, and how much breast milk versus formula they get. Partially breastfed babies are a gray area. Your pediatrician can work out the right plan, and the 4-month checkup is a natural time to ask.

Iron-rich first foods

When your baby is ready for solids, make iron-rich foods some of the first ones you offer. Serve them in a texture your baby can handle, such as smooth purees at first.

  • Iron-fortified infant cereal. One of the easiest sources, and the one the AAP names as an example of an iron-containing first food.
  • Meat and poultry, pureed or finely minced. They contain heme iron, the form the body absorbs best, and help your baby absorb iron from other foods eaten at the same meal, according to the NIH.
  • Beans, lentils, and tofu, mashed. These are good plant sources of iron.

Help the iron absorb. Serve plant sources of iron alongside a vitamin C food your baby is ready for, such as pureed strawberries, tomatoes, or broccoli.

You can keep breastfeeding while your baby learns to eat solids. Solid foods add iron alongside breast milk; they don’t need to replace it.

Safety with iron drops

  • Give only the dose your pediatrician recommends, measured with the dropper that comes with the product.
  • Store drops and all iron-containing products out of reach. Accidental iron overdose is a leading cause of fatal poisoning in children under 6, according to the NIH. This includes your own prenatal vitamins.
  • If a child swallows iron, call Poison Help at 1-800-222-1222 or a doctor right away.

What to do now

  • At the 4-month checkup, ask: “Does my baby need iron drops?”
  • Plan iron-rich first foods, such as fortified infant cereal, pureed meat, or mashed beans, for when your baby starts solids.
  • If your baby was born early, ask about iron at your first pediatric visit.
  • Move all iron products out of children’s reach.

Related reading

Sources

Updated October 2026. This article is for general information and is not a substitute for advice from your baby’s health care provider.