Great tasting Vitamin D supplement for children aged 3-7 years WellKid® Peppa Pig™ Vitamin D provides vitamin D3, the preferred form produced naturally by the body. Vitamin D contributes to children's normal immune system function. Vitamin D is also needed for normal growth and development of bone in children. With UK Department of Health recommended level of vitamin D (10µg) for children aged 1-4 all year round, and for over 5s especially during the autumn and winter months. Source: NHS Choices.