The pharmacy-trained guide to recognising iron deficiency in babies and toddlers — the signs GPs frequently miss, the dietary changes that make the biggest difference, and why too much milk after 6 months is the most common cause.
Iron deficiency is the most common nutritional deficiency in children under 5 in the UK. It is largely preventable. And because the symptoms — paleness, tiredness, poor appetite — are easy to attribute to other causes, it frequently goes unidentified for months. Here is what to know.
Babies are born with iron stores that were built up during the third trimester of pregnancy. These stores support healthy development for the first 4–6 months of life — after which, they begin to deplete. From around 6 months, babies need to obtain iron from their diet.
Iron is essential for haemoglobin production — the protein in red blood cells that carries oxygen. Iron deficiency impairs cognitive development, language development, and physical growth. The effects on brain development can persist even after iron levels are restored, which is why prevention is significantly more important than treatment.
Pale skin — particularly noticeable inside the lower eyelids and on the gums · Tiredness and reduced energy · Poor appetite · Frequent infections · Delayed development · Irritability and behavioural changes.
These signs are non-specific — they can indicate many conditions. If you are concerned, your GP can check iron levels with a simple blood test. Do not give iron supplements without a confirmed deficiency and medical guidance — excess iron is harmful.
From weaning at 6 months, prioritise iron-rich foods: red meat (beef, lamb) · dark poultry meat (chicken thighs) · oily fish · eggs · beans and lentils · tofu · iron-fortified cereals · dark green leafy vegetables (spinach, kale).
Pair iron-rich foods with Vitamin C to significantly increase absorption: mashed broccoli alongside red meat puree · kiwi or orange segments with iron-fortified cereal. Avoid giving cow's milk as a main drink before 12 months — it is a poor source of iron and can reduce absorption of iron from other foods.
Healthy full-term babies who are weaning well do not typically require iron supplementation beyond 6 months if their diet includes adequate iron-rich foods. Formula is fortified with iron — formula-fed babies are at lower risk than breastfed babies who are not weaning well.
If your GP identifies iron deficiency, they will prescribe appropriate supplementation. Pharmacy-bought iron drops are available but should only be used under medical guidance.
NHS Iron for babies · SACN Iron and Health 2010 · NICE CG84 · Reviewed April 2026.