What really matters when choosing milk for children aged one to five

Parents should prioritise protein, calcium and vitamin D, while avoiding added sugar and treating claims about DHA or probiotics with caution.

Parents choosing milk for children aged one to five need to look beyond marketing claims and focus on what is actually in the cup. Nutrition guidance from the World Health Organization, the American Academy of Paediatrics and the National Institutes of Health points towards the same broad idea: a good milk choice for young children is one that helps fill key nutrient gaps while keeping added sugar low. That means paying close attention to protein, calcium and vitamin D first, rather than being swayed by packaging claims about bonus ingredients.

The nutritional priorities also change as children grow. For toddlers and preschoolers, protein, calcium and vitamin D matter most for bones, teeth and muscle development, while iron and zinc support cognition and immunity. DHA, iodine and vitamin B12 are also important for brain and nerve development, and prebiotics such as GOS and FOS may help digestive health. The NIH says children aged one to three need 700 mg of calcium and 7 mg of iron a day, while those aged four to eight need 1,000 mg of calcium and 10 mg of iron; vitamin D needs remain at 15 micrograms, or 600 IU, across both age bands.

For children under one year old, cow’s milk is not recommended as a main drink. The CDC and MedlinePlus both say infants should instead have breast milk or iron-fortified infant formula, because cow’s milk does not provide the right mix of nutrients for that stage and can raise the risk of iron deficiency. After 12 months, whole pasteurised cow’s milk becomes an option, and the American Academy of Paediatrics says whole milk is still the preferred choice for children under two unless there is a specific medical reason to do otherwise.

The type of milk also matters. HealthyChildren.org advises against flavoured milk and other sweetened drinks because added sugars can contribute to weight gain and tooth decay, while the CDC similarly recommends unsweetened options. For families considering plant-based alternatives, the guidance is more limited: soy milk is the only one that is nutritionally comparable to cow’s milk, provided it is fortified; other plant drinks may not deliver enough protein or key micronutrients unless a clinician says they are appropriate.

In practice, parents should treat milk as a support food, not a replacement for a balanced diet. The safest checklist is straightforward: match the product to the child’s age, read the label for protein, calcium and vitamin D, choose milk with little or no added sugar, and do not rely on claims such as DHA or probiotics if the basic nutrition profile is weak. The National Library of Medicine’s feeding guidance also suggests serving milk in a cup rather than a bottle and keeping portions modest across meals and snacks.