Getting ready to start your baby on solid foods? You may be wondering whether it's safe to give eggs, peanuts, and other common allergens.
The short answer: yes — and in fact it's recommended. Current research shows that early introduction of allergens can actually help prevent food allergies.
Why Introduce Allergens Early?
Parents used to be told to delay allergenic foods. That guidance has now changed.
The landmark LEAP study from 2015 showed that babies who received peanut products early had an 81% lower risk of peanut allergy. The results were so clear that recommendations were reversed worldwide.
Today, the AAP (American Academy of Pediatrics) and WHO recommend that all infants be introduced to allergenic foods during the first year of life. Research confirms that early introduction from around 4–6 months of age is safe and may prevent food allergies from developing.
What do current guidelines say? The AAP recommends that all infants — including those at higher risk due to family history — be introduced to allergenic foods during the first year. Taste introductions can begin from 4–6 months.
The 8 Most Common Baby Allergens
These foods are responsible for the majority of allergic reactions in young children:
- Eggs — one of the most common allergens in infants
- Cow's milk/dairy — cheese, yogurt, and cow's milk in cooking from 10 months; cow's milk as a drink from 12 months
- Peanuts — always offer as peanut butter, never whole (choking hazard)
- Tree nuts — almonds, cashews, walnuts — always ground or as nut butter
- Wheat/gluten — often introduced via cereal or bread
- Fish — offer well-cooked and mashed
- Shellfish — shrimp, crab, lobster
- Soy — found in many processed foods
Helpful tip: Use a food tracking app or log to keep track of which allergens your baby has tried. This makes it easy to identify reactions and ensure you're covering all the key foods.
When to Introduce Each Allergen
Here is a suggested timeline based on current AAP guidelines:
From 4–6 months:
- Egg (well-cooked egg yolk first, then whole egg)
- Peanut butter (thin smear mixed into puree)
- Wheat/gluten-containing cereal
From 6–8 months:
- Cooked fish (cod, salmon)
- Soy (in small amounts)
From 10 months:
- Cow's milk in cooking (sauces, baked goods)
- Yogurt/fermented dairy (small amounts)
- Cheese as a finger food
Tree nut butters or finely ground nuts and shellfish (cooked and pureed) can also be introduced from 6 months. Never give whole nuts to children under 4 years due to choking risk.
Remember: All dairy products (cheese, yogurt, cow's milk in cooking) can be given from 10 months. Cow's milk as a drink from 12 months.
How to Introduce Allergens Safely
Follow these steps for safe introduction:
1. Start Small
Give a small taste — for example, half a teaspoon of peanut butter mixed into puree.
2. Introduce Early in the Day
Offer new allergens early in the day so you can observe your baby for several hours afterward. Don't try new foods right before bedtime.
3. Wait 2–3 Days
Introduce only one new allergen at a time. Wait 2–3 days before trying the next one so you can link any reactions to the right food.
4. Repeat Regularly
Once your baby has tolerated an allergen, it's important to give it regularly. Offering it 2–3 times per week is recommended to maintain tolerance.
5. Still Breastfeeding? Keep Going
Introducing allergens while you're still breastfeeding may offer extra protection. Breast milk contains enzymes that help your baby digest new foods.
Food introduction checklist: Keep a written log of what your baby has tried and any reactions. This is invaluable if you ever need to see a doctor or allergist.
Signs of an Allergic Reaction
It's important to know the difference between mild and severe reactions.
Mild Reactions (Common)
- Rash or redness around the mouth
- Slight swelling of the lips or face
- Hives (red, raised welts)
- Vomiting or loose stools
- Itching
Mild reactions don't require emergency treatment, but do follow up with your pediatrician.
Severe Reactions — Anaphylaxis
Call 911 immediately if your baby shows signs of anaphylaxis:
- Difficulty breathing, wheezing, or coughing
- Swelling of the tongue or throat
- Pale or bluish skin color
- Limpness or loss of consciousness
- Persistent vomiting
Anaphylaxis is rare with the first exposure, but requires immediate emergency treatment. Lay the baby flat with legs raised while you wait for help.
Non-IgE-Mediated Reactions
Some babies have delayed reactions (hours to days later):
- Persistent spitting up or vomiting
- Blood in stools
- Worsening eczema
- Distress and stomach pain
These reactions are most often linked to cow's milk protein. See your doctor for evaluation.
Family History of Allergies — What Should You Do?
Does a parent or sibling have a food allergy? That means your baby has increased risk, but it does not mean you should delay allergen introduction.
On the contrary: research shows that early introduction is especially important for higher-risk babies. The AAP recommends:
- Introduce allergenic foods from 4–6 months, same as for other babies
- Be especially careful to introduce one allergen at a time
- Wait 2–3 days between each new allergen
- Offer foods early in the day
- Follow up with your pediatrician if your baby has severe eczema
Severe eczema or known egg allergy? If your baby already has severe eczema and/or documented egg allergy, introducing peanut products should be done in consultation with your allergist or pediatrician before you start.
Baby-Led Weaning and Allergens — Can You Combine Them?
Yes! Baby-led weaning (BLW) and allergen introduction go well together. With BLW, your baby can explore foods at their own pace.
Good BLW options for allergens:
- Eggs: Omelet strips or scrambled eggs
- Peanut: Peanut butter thinly spread on toast sticks
- Fish: Steamed salmon in pieces your baby can grip
For more tips, see our complete BLW guide.
Frequently Asked Questions
Can my baby have peanut butter?
Yes, from 4–6 months. Always offer peanut butter — never whole peanuts, which are a choking hazard for children under 4. Mix a thin smear into puree or spread on soft bread sticks.
What if my baby refuses allergenic foods?
That's completely normal. It can take 10–15 attempts before a baby accepts a new flavor. Keep offering without pressure.
Do I need to introduce allergens even if there's no family history?
Yes. The AAP recommends that all infants be introduced to allergenic foods during the first year, regardless of family history.
When should I contact a doctor?
Contact your doctor if your baby has had an allergic reaction, has severe eczema, or if you're unsure how to proceed. Call 911 for anaphylaxis.
Can babies have honey?
No. Honey should be avoided for the entire first year due to the risk of infant botulism. This is not about allergy but is an important food safety rule.