The guidelines, published in the Journal of Allergy and Clinical Immunology, incorporate findings from a recent study called the LEAP trial which concluded that introducing peanuts into young children can actually stop a peanut allergy from forming down the line. And the method can be most effective in children who would otherwise be at risk for developing a peanut allergy.

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National Institute of Allergy and Infectious Diseases director Dr. Anthony Fauci says that the new guidelines are meant to help spread the word about peanut allergy prevention and give parents and health care providers precise instructions on what to do. The guidelines were created by a team of experts from groups like the American Academy of Pediatrics, the American Academy of Family Physicians, the American Academy of Allergy, Asthma & Immunology, and others.

So what are the recommendations? They fall into three separate buckets: the highest-risk children, such as those with severe asthma or an egg allergy (or both); medium-risk children, such as those with mild-to-moderate eczema; and the lowest risk children, who don’t have any of these medical issues or a family history of peanut allergies. The highest-risk children should be tested for a peanut allergy when they’re between four and six months old, and if they’re found not to have the allergy at that stage, they should be exposed to peanut-containing foods at the time. The lowest-risk children can eat peanut-containing foods at any age while moderate-risk children should be given these foods at six months.

An estimated 15 million Americans have food allergies, including one in 13 children, and the vast majority of them involve nuts.