Change 4 Life has lots of information that you’ll find helpful:
Food Facts and demos: https://www.nhs.uk/change4life/food-facts#p0xh4e5m5sYwwWcv.97
National Child Measurement Programme explanation for parents: https://www.nhs.uk/change4life/your-childs-weight/home#sWYyTGgb6Zg5PUEL.97