When a baby develops a peanut allergy in infants, a serious immune reaction to peanut proteins that can trigger breathing trouble, hives, or even life-threatening anaphylaxis. Also known as peanut hypersensitivity, it’s one of the most common and dangerous food allergies in young children. Unlike some allergies that fade with age, peanut allergies often stick around for life—and they can strike fast, even on first exposure.
For years, parents were told to avoid peanuts until age 3. But research changed everything. The landmark LEAP study showed that introducing peanut-containing foods as early as 4 to 6 months—especially for babies with eczema or egg allergy—can cut the risk of developing a peanut allergy by up to 80%. This doesn’t mean giving whole peanuts (choking hazard!), but smooth peanut butter mixed into purees or specially designed peanut puffs. The key is consistency: small amounts, regularly, over time. If your baby has severe eczema or an egg allergy, talk to your pediatrician before starting. They might recommend allergy testing first, using a skin prick or blood test to check for sensitivity.
Watch for signs after introducing peanut: hives around the mouth, swelling of the lips or tongue, vomiting, wheezing, or sudden fussiness. If your baby has trouble breathing or goes limp, call 911 immediately. That’s anaphylaxis in babies, a full-body allergic reaction that needs emergency epinephrine. Also known as severe allergic reaction, it’s rare but deadly if not treated fast. Even if symptoms seem mild at first, don’t wait. Allergic reactions can worsen quickly. Keep an epinephrine auto-injector on hand if your doctor prescribed one.
Many parents worry about cross-contamination—like a spoon used for peanut butter then used for another food. While it’s smart to clean utensils, most reactions happen from direct ingestion, not tiny traces. Still, if your child has a confirmed allergy, read labels carefully. Peanuts hide in sauces, baked goods, and even some cosmetics. And don’t assume ‘nut-free’ means safe—tree nuts and peanuts are different, but many facilities process both.
There’s no cure yet. But managing peanut allergy in infants is about prevention, early detection, and preparedness. You’re not alone—millions of families navigate this every day. Below, you’ll find real-world advice from parents and doctors on how to introduce peanuts safely, recognize warning signs, handle reactions, and live confidently with a peanut allergy. These aren’t guesses. They’re based on studies, clinical experience, and what actually works in daily life.
Learn how early peanut introduction can reduce allergy risk by up to 98%. Discover the latest guidelines, safe methods, and what to avoid for babies at all risk levels.