According to a study, children's peanut allergies decrease after being advised to give the allergen to infants.

Main findings:

A large‐scale observational study found that when infants were introduced to peanut‐containing foods early (as young as ~4 months of age) the incidence of peanut allergy in children aged 0–3 dropped by more than 27% after the first guideline change in 2015, and by over 40% after broader guidelines in 2017. 

The study estimates that about 60,000 children in the U.S. have avoided developing peanut allergy as a result of these guideline changes. 

A related trial (the “LEAP‑Trio trial” building on the earlier LEAP trial) found that regular peanut consumption from infancy up to age 5 reduced peanut allergy risk by ~71% into adolescence — even if the child later avoided peanuts. 

Conclusions / Implications:

The results support the idea that early introduction of peanut‐based foods can promote immune “tolerance” rather than hypersensitivity/allergy.

Changing infant-feeding guidelines (from delaying allergen introduction to introducing early) appears to have had a real‐world public‐health impact.

While the drop in peanut allergies is substantial, the study notes that adoption of the guideline has been incomplete — for example only ~29% of pediatricians reported following the expanded 2017 guidance. 

The research still emphasises caution: parents should consult healthcare providers before introducing peanut products in infancy, and safe forms (e.g., smooth peanut butter thinned or peanut pastes) should be used (not whole peanuts) to avoid choking risk. 

Caveats / things to keep in mind:

The large‐scale data come from observational health-record studies, not randomized controlled trials across the whole population, so while association is strong, absolute causation still has typical limits for observational designs. 

The drop in peanut allergy is significant in the 0–3 age group; long‐term trends and applicability in all populations may require further monitoring.

Babies at high risk (e.g., with eczema or existing egg allergy) may need special assessment before introduction of major allergens.