What is a key benefit of breastfeeding to infants?

Breastfeeding is known to provide a key benefit of aiding in building immunity for infants. This is primarily because breast milk contains a variety of immunological factors, including antibodies (especially immunoglobulin A or IgA) that help protect the infant from infections. These antibodies are transferred from the mother and can significantly reduce the incidence of illnesses such as respiratory infections, gastrointestinal infections, and other common childhood diseases.

In addition to antibodies, breast milk also contains other components such as lactoferrin and various cytokines that contribute to the development of the infant's immune system. This immune support is particularly important during the early stages of life when infants are more vulnerable to infections. As such, breastfeeding not only provides nutrition but also plays a crucial role in promoting health and safeguarding against disease.

Other options, while related to aspects of infant health and development, do not capture the specific immune-boosting benefits that breastfeeding offers. For example, while breastfeeding may impact growth positively, it does not guarantee larger future growth or prevent all allergic reactions, as these outcomes can be influenced by numerous other factors, including genetics and environmental exposures.