Hi PP Organic follow on milks are designed to meet your baby’s nutritional needs, which change at around 6 months old. For example, the supply of iron & other vitamins & minerals they were born with may be running low, so they need a mixed & varied weaning diet to ensure they continue to get all the nutrients they need for strong & healthy growth. The recommended iron intake for a 7 month old, for example, is 7.8mg a day – almost as much as an adult man (8.7mg)*. A 7 month old, for example, needs 7.8mg a day of iron – almost as much as an adult man (8.7mg). Milk continues to play an essential role in supplying these important nutrients & follow on milks are enriched with iron & many essential minerals including calcium, phosphorus, selenium, zinc & essential vitamins A, B, C, D, E & K (as required by law).