Food Allergens for Babies

Introducing Food Allergens to Your Baby? This Guide is for You

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Updated on May 1, 2024

Reviewed by Israa Saeed

Introducing babies to solid foods is a thrilling milestone, but it can also be a time of worry for parents, especially when it comes to high-allergy foods. Peanut butter, eggs, milk, and other common allergens can trigger severe reactions in some babies, making it crucial to approach their introduction with caution and knowledge.

In this comprehensive guide, we’ll delve into the world of food allergens for your baby, providing you with the necessary information to make informed decisions and navigate this important phase of your child’s development. We’ll address common concerns, dispel myths and misconceptions, and offer practical tips for introducing these foods safely and effectively.

By the end of this guide, you’ll be well-equipped to navigate the world of high-allergy foods for your baby, ensuring a safe and healthy journey as they explore the vast array of flavours and textures that solid foods have to offer.

Gradual Introduction Is Key

Starting off slowly is the best way to give your baby new foods; this means giving tiny bits at first. It’s a good idea to do this, especially with high-allergy foods. Foods like milk, eggs and nuts can cause allergies to some babies, so you should not give them all at once. Instead, you must slowly add them into meals over time.

The goal is to find out if your baby likes the food and if it suits them before making it a regular part of their diet. If you start when they are between four and six months old, it could help stop allergies from forming later on. So, always make sure that any new food is well-cooked and easy for your baby to eat.

Start With Small Amounts

Always start with a wee bit of new food when you feed your baby. It could be as tiny as one-eighth of a teaspoon. The rule is simple—less is more, at least in the beginning. This way, you can see if your baby likes this food and look for signs that indicate they might be allergic to it. If there are no issues, gradually add a little more over time.

In this slow manner, you introduce food allergens to your baby carefully but still help them build up tolerance against allergies. That’s how you should introduce your baby to well-cooked eggs and smooth peanut butter. If it goes smoothly, these foods will be part of their diet.

Watch for Any Signs of Allergic Reactions

Babies can show signs of allergic reactions when they eat new foods. They may get hives, a type of skin rash, and their faces might swell up. Some babies may have tummy pain or start to throw up. It’s vital to see these signs early on, so keep your eyes open for any changes in your baby after meals. If you spot anything unusual, talk to a doctor right away and make sure not to give that food again until the doctor says it’s OK.

Introduce One New Food at a Time

Giving your baby only one new food allergen at a time is smart. This way, you can see if they have an allergic reaction or not. Wait for about five days before you try another new allergen. During this time, watch if your baby shows any signs of allergy, like a rash or upset tummy.

You can then know which food allergen caused the allergy because there was only one new food allergen in their diet. Try giving soft foods, like cooked eggs, first to avoid choking risk. Remember, always keep a close eye on how your baby feels after eating new food allergens.

Common Food Allergens for Your Baby

Common high-allergy foods for your baby may include milk, eggs, wheat, shellfish, fish, tree nuts, peanuts, and sesame seeds. Read on to learn more about these allergenic foods and how you can introduce them safely to your little one.

Food Allergens for Babies
Food Allergens for Babies


Milk stands as one of the common food allergens for babies. This allergy is often seen in infants and young children. The key cause of this allergy is the baby’s body reacting wrongly to milk proteins. Such proteins can be found in animal milk, like those from cows, sheep, and goats. This does not mean every child will always have a milk allergy. Plenty of kids do outgrow it after some time. However, it’s very important for you, as a parent or carer, to know about these allergies early on. Then, you can seek the right tips and needed help.


Eggs can cause problems for some babies. Children are often allergic to them. The bad signs can come fast or slow after eating eggs. This is why watching your baby is so important when you give them an egg. Most often, this allergy shows up in young ones and fades as they grow older. Yet, it’s best to be careful and introduce eggs slowly to your baby’s diet.


Wheat is a food that can cause allergies because the grain is tied to most food allergy cases. It holds gluten, which may worry parents when they give it to their little ones. A lot of young children—about 1% in the U.S.—report having an allergy to wheat. In fact, two out of every three kids with this allergy might show signs like bad belly or skin rash after eating wheat-based foods.



Shellfish, like shrimp and lobster, is one of the most common food allergens for babies. It may cause anaphylaxis, which is a severe and potentially life-threatening allergic reaction. If your baby has a shellfish allergy, it’s important to avoid giving them any shellfish products. Unfortunately, there is currently no cure for shellfish allergy. That’s why it’s crucial to be cautious when introducing it to your baby. Allergic reactions to shellfish can be severe in children, so it’s best to consult with a healthcare professional if you suspect an allergy.


Fish is another common high-allergy food for your baby. Some types of fish, like salmon, tuna, catfish, and cod, can trigger allergies. They can cause allergic reactions in some children, ranging from mild symptoms, like skin rashes or hives, to more severe adverse reactions, like difficulty breathing or anaphylaxis.

It’s important to avoid fish if your baby has a fish allergy to prevent any allergic reactions. If you suspect your baby may have a fish allergy, it’s best to consult with a healthcare professional for guidance on how to manage their allergies effectively.


Peanuts are one of the most common food allergens for babies, as they can often cause them food allergies. So, it’s important to be mindful of introducing peanuts to your baby gradually and in small amounts. Then, watch out for any hints of allergic reactions, such as skin rashes, swelling, difficulty breathing, or digestive issues. If an allergic reaction appears, seek medical attention immediately and avoid giving your baby peanuts in the future.

Tree Nuts

When introducing high-allergy foods to babies, tree nuts (hazelnuts, walnuts, almonds, etc.) should be approached with caution. Between 25% and 40% of individuals allergic to peanuts also have a reaction to at least one tree nut.

Food Allergens for Babies - Tree Nuts
Food Allergens for Babies – Tree Nuts

It is recommended to start with smooth nut butters or pastes or even nut flours like almond meal, if available. These options can be suitable finger foods for babies as well. However, it’s important to always watch for any cues of allergic reactions when introducing them.

Allergic reactions caused by tree nuts can vary from slight symptoms, such as hives and itching, to more serious reactions, like anaphylaxis. So, it’s critical to consult with a healthcare professional before introducing tree nuts and take appropriate measures in case of an allergic reaction.

Sesame Seeds

Sesame seeds are one of the common food allergens for babies. In fact, sesame is the ninth most common food allergy in the United States. They can cause allergic reactions in both children and adults. Sesame allergy may not be as well-known as other allergies, like peanuts or shellfish, but it can still cause severe reactions. So, it’s important to be aware of this allergen when introducing it to your baby.

It’s worth noting that consuming sesame seeds during pregnancy can increase the likelihood of a child developing peanut, tree nuts, and other food allergies. If you’re a fan of sesame seeds or have a history of allergies in your family, it’s something to keep in mind when introducing solids to your baby.

Signs of Food Allergies in Babies

The signs of food allergies in babies can range from skin rashes and swelling to difficulty breathing and digestive issues. So, it’s crucial to be aware of these symptoms, as they can indicate a potential allergic reaction. Let’s explore the symptoms in detail.

Skin Rashes or Hives

Skin rashes or hives are common signs of food allergy in babies. When a baby has an allergic reaction to certain food allergens, their skin may become red, itchy, and covered in small bumps or hives. Additionally, their face may swell up. These symptoms occur because the body releases histamines when it reacts to allergenic foods, causing irritation and inflammation on the skin.

If you notice your baby developing an abnormal rash or hives after eating a particular food, it’s important to seek medical attention right away. Remember, it’s always better to be safe than sorry when it comes to your little one’s health.


Swelling is a very common sign of food allergies in babies. It can happen in different parts of the body, like the uvula, face, eyes, lips, and tongue. When a baby has an allergic reaction to certain foods, their body may respond by swelling up.

This can be scary for both parents and babies. As a parent, it is important to recognise these symptoms and take action right away. If you notice any swelling or changes in your baby’s appearance after introducing a new food, it’s crucial to seek medical attention immediately.

Swelling can also cause discomfort and difficulty breathing for babies, so it’s essential not to ignore any signs or symptoms. Remember that each baby is unique, and their reactions can vary from mild to severe when it comes to food allergies.

Difficulty Breathing

Difficulty breathing is a serious symptom of food allergies in babies. It is caused by an allergic reaction that affects the lungs, leading to respiratory distress and wheezing. This can make it hard for babies to breathe properly and may even trigger asthma symptoms. In severe cases, anaphylactic shock can occur, causing narrowing of the airways (bronchial constriction) and making it extremely difficult for the baby to get enough air.

Along with difficulty breathing, other signs of a food allergy may include digestive issues and a drop in blood pressure, leading to fainting. If your baby exhibits any signs of food allergies, it’s important to seek immediate medical attention for proper diagnosis and management.

Digestive Issues

Food allergies can also cause digestive issues in babies. These issues can include vomiting, diarrhoea, and abdominal pain. It’s important to watch for these symptoms as they can lead to dehydration and discomfort for your baby.


When a baby has a severe allergic reaction to food, it can lead to anaphylaxis, a very serious and potentially life-threatening allergic reaction. It can cause difficulty breathing, swelling of the throat and tongue, a drop in blood pressure, and even loss of consciousness. If your baby develops signs of anaphylaxis after eating food allergens, seek immediate medical attention. Anaphylaxis requires quick treatment to prevent further complications.

What to Do if an Allergic Reaction Occurs

If you catch any signs of an allergic reaction in your baby, it is important to seek immediate medical attention and follow emergency action plans. Don’t wait—take quick action to ensure the safety and well-being of your little one. To learn more about handling food allergies in babies, continue reading.


Seek Medical Attention Immediately

If your baby has an allergic reaction to food allergens, it’s really important to get medical help straight away. Allergic reactions can be severe, which necessitates immediate treatment. Don’t hesitate to call for emergency medical care if you notice signs like difficulty breathing, swelling, or a severe rash.

Follow Emergency Action Plans

It is also important to know what to do and follow the emergency action plan you have in place. FARE Food Allergy & Anaphylaxis Emergency Care Plan provides recommended treatment for allergic reactions in babies. It outlines the steps you should take if your baby has a reaction. You should follow the instructions on the emergency action plan. Seeking medical attention immediately is also essential.

Avoid the Allergenic Food in the Future

If your baby has developed an allergic reaction to a certain food, it is important to avoid that allergenic food in the future. This can help prevent any further reactions and keep your baby safe. Remember, always read the labels carefully when buying packaged foods and be cautious when dining out.

Consult a Healthcare Professional for Further Guidance

It is also important to seek medical attention immediately. A healthcare professional can provide the necessary guidance and support for managing food allergies in your baby. They can help with accurate diagnosis, develop a treatment plan, and offer advice on how to prevent future reactions. Don’t hesitate to ask a healthcare professional for expert assistance in dealing with food allergies for your little one.

In conclusion, when it comes to introducing food allergens to babies, taking it slowly and being cautious is important. Start with small amounts and watch for any signs of allergic reactions. Remember to introduce one new food at a time. If an allergic reaction starts to develop, seek medical attention at once, avoid this allergenic food in the future, and consult your healthcare provider for personalised advice.


1. When can I introduce high-allergy foods to my baby?

It is recommended to introduce high-allergy foods one at a time at six months old while monitoring for any allergic reactions. Consult with your paediatrician for guidance.

2. Should I completely avoid introducing high-allergenic foods to my baby?

No, it is not necessary to completely avoid introducing highly allergenic foods unless there is a known family history of allergies or your healthcare provider advises against it. Gradually introducing these foods can help prevent allergies from developing.

3. Are there any steps I can take to reduce the risk of food allergies in my baby?

Breastfeeding exclusively for the first six months and continuing breastfeeding while gradually introducing solid foods can reduce the risk of developing food allergies in babies.

4. Can my child outgrow allergy over time?

Most children’s allergies go away as they grow older (by the age of five years), but allergies to peanuts, tree nuts, fish, shellfish, crabs, and squids usually last a lifetime.

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