Evidence now shows that early introduction of peanut-containing products for most children reduces the incidence of peanut allergy. As a result, The AAP now recommends early introduction. Begin introducing these foods before 12 months of age
Consider first doing allergy testing in children at high risk for an allergic reaction (e.g., kids with severe eczema or a 1st-degree relative with a peanut allergy).
Further Reading
Ann Allergy Asthma Immunol. 2015 Aug;115(2):87-90. https://www.ncbi.nlm.nih.gov/pubmed/26122934
Pediatrics. 2015 Aug 31. pii: peds.2015-2394. https://www.ncbi.nlm.nih.gov/pubmed/26324871