According to US recent reasearch Babies should be given peanut early - some at four months old - in order to reduce the risk of allergy
Studies have shown the risk of peanut allergy can be cut by more than 80% by early exposure.
The National Institute of Allergy and Infectious Diseases said the new guidance was "an important step forward".
However, young children should not eat whole peanuts, because of the risk of choking.
- Children with other allergies or severe eczema should start on peanut-containing foods at between four and six months old, with medical supervision
- Babies with mild eczema should have peanut-containing food at about six months old
- Those with no eczema or allergies can have peanut-containing food freely introduced
According to Dr Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, said: "We expect that widespread implementation of these guidelines by healthcare providers will prevent the development of peanut allergy in many susceptible children.