Exclusive breastfeeding for at least four months has been linked to reduced odds of asthma and Immunoglobulin E (IgE) sensitization through age 24. This research offers new evidence that early feeding patterns can influence allergic outcomes well into adulthood.
The study, which analyzed data from nearly 4,000 participants in a Swedish birth cohort, found that exclusive breastfeeding for four months or more was associated with a 25% reduction in the overall odds of prevalent asthma by young adulthood. The protective effect was most pronounced in earlier years, with a significant association for lower asthma risk observed up to age 12. The findings also suggest a link to lower odds of persistent asthma.
Beyond asthma, the protective pattern extended to IgE sensitization, indicating a broader relationship with the development of allergic diseases. These conclusions were further strengthened after excluding participants with early wheeze or eczema, reinforcing the observed association between longer exclusive breastfeeding and reduced asthma and sensitization risk.
This longitudinal study, following participants from infancy into adulthood with repeated immunological assessments, suggests exclusive breastfeeding may be most impactful for asthma developing within the first 12 years of life. The data point to a specific benefit in early and persistent disease pathways and IgE sensitization, offering relevant insights for clinicians discussing infant feeding and long-term respiratory health.