Cow and Gate Growing Up Milk is an enriched with vitamin D, calcium and iron. Cow and Gate Growing Up Milk 4 (for toddlers aged 2-3 years) is nutritionally tailored to keep up with your get-up-and-go toddler’s changing needs – from their second birthday. If your little one is eating and drinking well, the Department of Health recommends that they can switch from full-fat to semi-skimmed milk once they turn two. Our Growing up Milk 4 is semi-skimmed and enriched with key nutrients for growing toddlers. In this vitamin D used for normal bone development and iron is used to support normal cognitive development.