Food Allergy Risk Calculator

Eczema (atopic dermatitis) is the strongest risk factor for food allergy

Family history of food allergy, eczema, asthma, or allergic rhinitis

Skin prick test or specific IgE blood test

Should I delay introducing peanuts if there's family history of peanut allergy?

No, delaying introduction actually increases allergy risk. Current guidelines recommend early introduction (4-11 months) for all infants, including those with family history. High-risk infants with severe eczema should consult an allergist first but still introduce early.

What's the evidence for early introduction?

The landmark LEAP trial showed that early peanut introduction (4-11 months) reduced peanut allergy by 81% in high-risk infants with severe eczema. Similar benefits have been shown for egg. The key is regular exposure, not just one-time introduction.

How do I safely introduce peanuts to my baby?

For low to moderate risk infants, mix smooth peanut butter or peanut powder with breast milk, formula, or fruit/vegetable puree (about 2 teaspoons peanut butter mixed into food, 3 times per week). Never give whole peanuts or chunks due to choking risk. Introduce at home when you can observe for 2 hours.

Does a positive allergy test mean my child is allergic?

Not necessarily. Sensitization (positive test) without clinical symptoms does not equal allergy. Many infants with positive tests can safely eat the food. An oral food challenge under medical supervision is the gold standard for diagnosis.

My baby has eczema - should I get allergy testing first?

For mild eczema, routine testing is not needed. Introduce foods at home with observation. For moderate to severe eczema, consider consulting an allergist who may recommend testing for peanut before introduction. Testing for other foods without symptoms is generally not helpful.

What are signs of an allergic reaction?

Immediate reactions (minutes to 2 hours) may include hives, swelling, vomiting, difficulty breathing, or anaphylaxis. Mild reactions might be limited to rash around the mouth. Delayed reactions can include eczema flares or vomiting hours later. Seek immediate medical care for difficulty breathing, persistent vomiting, or significant swelling.

Can breastfeeding prevent food allergies?

Breastfeeding is beneficial for infant health, but there's no clear evidence that exclusive breastfeeding prevents food allergies. Mothers do not need to avoid allergens during breastfeeding or pregnancy unless they are personally allergic. Complementary feeding with allergens should begin around 6 months (or 4-6 months for high-risk infants) while continuing breastfeeding.

What if my baby refuses the allergenic food?

Keep trying in different forms or mixed with preferred foods. It may take 10-15 exposures before acceptance. The key is regular exposure once successfully introduced (2-3 times weekly) to maintain tolerance. Even small amounts count - a lick or taste is better than no exposure.