While there is some variation between countries regarding specific recommendations about how to implement early introduction for food allergy prevention, an international consensus has been reached in some key areas. First, national guidelines around the world—including those from Europe, Asia, Australia, Canada, and the United States—agree that it is important to introduce certain commonly allergenic solids (e.g., peanut, egg) into the infant diet during the first year of life. Most countries have identified the 4- to 6-month period as a key window of opportunity for food allergy prevention. Furthermore, no major national or international allergy organization recommends delaying introduction of allergenic solids until after 1 year of age, and most countries highlight the particular importance of early introduction among infants at highest risk. 

 However, there are also some key differences. In contrast with the U.S., many countries do not recommend peanut-specific IgE testing in high-risk infants, citing the safety of food allergen introduction, the exceedingly low risk of serious food allergy reactions with first exposure in babies younger than 1 year, and logistical barriers to testing, which could prevent uptake of early introduction as a key public health intervention.