When you compare calcium fortified plant milks for a child aged 1–5, don’t stop at calcium. Check protein, energy, vitamin D, iodine and added sugars, too. Fortified, unsweetened soy drinks are often nutritionally closer to cow’s milk than oat or almond drinks, but no single label tells you whether a drink suits your child’s whole diet.
How To Compare Calcium Fortified Plant Milks
Compare products using the same serving size, ideally the figures per 100 millilitres (about 3.4 US fluid ounces). Then look for these nutrients:
- Protein: Soy drinks usually provide more than oat or almond drinks. In a Swiss laboratory comparison of 27 plant-based drinks bought from two retailers, most alternatives other than soy contained no more than 1 gram of protein per 100 grams; cow’s milk and soy drinks contained more than 3 grams. Products differ, so use the label rather than assuming every soy drink is high-protein.
- Energy: Many plant drinks have less energy than cow’s milk, though formulations vary. If a drink regularly replaces milk, consider its energy alongside the rest of your child’s meals—not in isolation.
- Calcium and vitamin D: Look for fortification and compare the amount with cow’s milk or local guidance. “Fortified” does not guarantee that products contain the same amounts. A calcium claim also says nothing about protein or iodine.
- Iodine: Check whether it is listed. Iodine is often missing from plant drinks, even when calcium is added. A German diet-modeling study found that replacing milk with fortified drinks largely maintained the micronutrients it assessed except iodine.
- Added sugars: Choose an unsweetened option where possible and check the ingredients and nutrition panel. “Unsweetened” helps you avoid added sweeteners, but it does not make a drink a nutritional match for milk.
Soy is often the closer match because it tends to provide more protein, and some products are fortified with calcium and vitamin D. That is a comparison, not a guarantee of equivalence: protein quality and mineral absorption can differ, and iodine may still be absent. Oat and almond drinks can be fortified too, but commonly provide less protein. Check each product, including any version marketed for children.
Age And Local Advice Change The Answer
Ordinary plant-based drinks are not substitutes for breast milk or infant formula under 12 months. Plant-based drinks and specially formulated products are not interchangeable. If a baby needs a dairy-free formula, ask a clinician which product is appropriate.
After 12 months, recommendations differ by country. UK guidance described in a 2023 European market analysis allows an unsweetened, calcium-fortified plant drink as a main drink for children older than 12 months. Canadian guidance advises against plant drinks as cow’s-milk alternatives before age 2, even when fortified. New Zealand guidance allows fortified soy from age 1, with vitamin B12 fortification relevant for vegan children who do not get B12 another way; it advises against rice and other grain drinks as the sole cow’s-milk substitute up to age 5.
Rice-drink advice also varies. Australian guidance summarized in a 2021 commentary allowed full-fat, calcium-fortified rice or oat drinks only with medical supervision and a diet rich in other protein and vitamin B12 sources; it advised against other plant drinks as cow’s-milk alternatives. Guidance can change, so check your local child-health service rather than applying another country’s rule.
Fortification Helps, But The Whole Diet Matters
A 2025 German study modeled what might happen when cow’s milk was replaced in balanced menus for children aged 1–3. The researchers assessed six soy, oat and almond drinks available in Germany. In the model, unfortified drinks reduced estimated daily calcium, vitamin B2, B12 and iodine intake to about half; fortified products maintained the assessed nutrients except iodine. This was a dietary simulation, not a trial measuring children’s growth or health. It shows why fortification and the rest of the menu matter, not that every child will have the same outcome.
If a plant drink will replace cow’s milk regularly, especially in a vegan diet, compare the label with your local guidance and consider the child’s full food pattern. Ask a paediatrician or registered dietitian for help if the replacement is frequent, your child has an allergy, or you are unsure how the diet covers key nutrients.