Lactoferrin is suitable for children over 6 months of age, and generally cannot be taken continuously for more than 6 months. Lactoferrin can be supplemented until the child is about 3 years old. If the baby’s resistance is relatively poor, it can be taken appropriately, however, in principle, it is not recommended to take it for a long time. It is best taken within an hour after a meal (after breastfeeding), with warm water, as this will reduce the stimulation of the stomach and also supplement vitamin C, which promotes the absorption of lactoferrin. Lactoferrin is commonly found in the milk and other tissue fluids of mammals (e.g., in tears, bile, synovial fluid, and neutrophils), and is most abundant in colostrum, gradually decreasing with the duration of breastfeeding. Lactoferrin, a non-heme iron-binding protein, is a member of the transferrin family and is one of the nutrients that protects new life from immunity for the first time. Lactoferrin promotes the absorption of iron in the body. After a baby sucks on breast milk, the lactoferrin in breast milk binds with high affinity to iron in his digestive tract, transporting it to the cells of the small intestine and releasing it to supply the baby’s whole body needs. Another special function of lactoferrin is that it is antibacterial, antiseptic and antiviral, and it is not harmful to probiotics (such as bifidobacteria) in the human body. Lactoferrin also promotes and enhances the immune function of immune cells such as neutrophils, macrophages and natural killer cells in the body, and lactoferrin regulates the production of antibodies in the body. Theoretically, lactoferrin may have the above-mentioned effects, but whether the actual product can play a role is still subject to many influences, do not blindly follow the trend to use.