Milk powder is different. The only difference between the purple, blue and yellow of the gold collar is that the milk powder is different. Purple cover is a intensive care series, which contains four key nutrients: protein, lactoferrin, nucleotide and compound probiotics. Unique lactoferrin, lactoferrin helps to promote iron absorption and enhance resistance. The yellow cover is Bao series, which contains three key nutritional elements: protein, compound probiotics and prebiotics, but it is an old package of Bao series, and the blue cover is a new package of Bao series introduced in 2020. Yilijin Lingguan is a brand of infant formula milk powder under Yili, which focuses on infant nutrition research in China, accumulates tens of millions of nutritional data, and assembles more than 2,500 high-tech R&D teams around the world to develop high-quality formula milk powder.