3'-Sialyllactose is widely used in the field of infant nutrition due to its presence in human breast milk. It plays a crucial role in supporting early immune system development and promoting gut health in newborns. This compound is often added to infant formula to mimic the benefits of breast milk, helping to enhance the growth of beneficial gut bacteria and protect against harmful pathogens. Additionally, it is being studied for its potential applications in dietary supplements and functional foods aimed at improving overall gut health and immunity in adults. Research also explores its use in therapeutic treatments for gastrointestinal disorders and as a component in probiotics.