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The first 1,000 days of life, spanning prenatal development and the initial two years post-birth, have a profound impact on future health. Maternal nutrition before and during pregnancy significantly influences fetal programming, shaping the fetus’s development and potential for chronic diseases.
Breastfeeding acts as a defense against disrupted programming by providing vital bioactive compounds that enhance immune maturation, organ growth, and the establishment of a healthy gut microbiome. This combats infections and inflammation, especially important as the newborn’s gut microbiome contributes to immune stimulation, reinforcing immune robustness and metabolic function.
Poor maternal diets high in fat and sugar, however, can negatively affect breast milk composition, newborn immunity, and microbial colonization, rendering infants more susceptible to compromised immunity and microbial imbalance.
The first few weeks of life are crucial, as newborns have an underdeveloped adaptive immune system, making them susceptible to infections. Breast milk acts as a primary source of immune components that strengthen the infant’s immunity, transferring maternal cells and bioactive molecules that support immune responses.
Proinflammatory cytokines in breast milk are influenced by factors like gestational periods and maternal health. Transfer of immunogenic cells from breast milk to various tissues is observed in murine models, although the exact mechanism remains unclear.
Maternal microchimerism (MMc) involves maternal cell transfer to newborns, contributing to immune processes like tolerance. Breastfeeding introduces immunogenic cells to newborns, including dendritic cells, macrophages, natural killer cells, and T regulatory cells, fostering immune development. This bidirectional immune crosstalk, along with maternal antibodies and T-cell transmission, aids in forming the newborn’s immune system and underscores the importance of breastfeeding.
Maternal antibodies, particularly secretory IgA and antigen-specific IgG antibodies, play a crucial role in newborn immune defense, especially during the initial weeks of life. Breast milk supplies these antibodies, with dimeric IgA secreted by the mammary gland and transferred through endocytosis. While IgG1 antibodies decline over time, IgA antibodies continue to be provided through breastfeeding.
Maternal antibodies peak at around 14 weeks in mice, and while they provide early protection, their long-term effects and duration on newborn immunity remain uncertain. Additionally, maternal transmission of T cells, particularly RORฮณ+ Tregs, through breastfeeding is demonstrated in murine models. These T cells control gut inflammation, promoting bacterial clearance and reduced inflammation in newborns. The interaction between breastfeeding and the newborn’s microbiota further influences postnatal immunity, highlighting their interconnected relationship.
Link to the full article (Frontiers in Pediatrics):
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8567139/pdf/fped-09-744104.pdf
