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Food Allergies in Children

What is food allergy in children?

A food allergy is when your child’s body has a bad immune reaction to a certain food. This is different from a food intolerance which does not affect the immune system. This is true even though some of the same signs may be present.

What causes food allergy in a child?

Your child's immune system fights off infections and other dangers to keep him or her healthy. Food allergy occurs when your child's immune system decides that a food is  a "danger" to your child's health. The reason this happens isn't clear. Your child's immune system sends out immunoglobulin E (or IgE) antibodies. These antibodies react to the food and cause the release of histamines and other chemicals. These chemicals can cause hives, asthma, itching in the mouth, trouble breathing, stomach pains, vomiting, or diarrhea. It doesn't take much of the food to cause a severe reaction in highly allergic children.

Most food allergies are caused by these foods:

  • Milk

  • Eggs

  • Wheat

  • Soy

  • Tree nuts

  • Peanuts

  • Fish

  • Shellfish

Eggs, milk, and peanuts are the most common causes of food allergies in children. Although many children “outgrow” their allergies, some food allergies may be life long.

Discuss your child's food allergies with his or her allergy healthcare provider.

What are the symptoms of food allergy in a child?

Allergic symptoms may start within minutes to an hour after eating the food. Symptoms can occur a bit differently in each child. They can include:

  • Severe nausea or vomiting

  • Diarrhea

  • Stomach cramps or stomach pain

  • Red, itchy rash (hives)

  • Swelling of the face

  • Eczema

  • Itching or swelling of the lips, tongue, or mouth

  • Itching or tightness in the throat

  • Dizziness, with lowered blood pressure

  • Asthma symptoms, such as coughing, runny or stuffy nose, wheezing, or trouble breathing

  • A feeling of impending doom

It doesn't take much of the food to cause a very bad reaction in highly allergic children. In fact, a tiny piece of a peanut or a small sip of milk can cause a severe reaction in a child that is highly allergic.

Some babies may have non-life-threatening, delayed allergies to milk, soy or other allergens. These symptoms often are not like the symptoms of other allergies. Instead they may include:

  • Colic or fussy behavior

  • Blood in your child’s stool

  • Poor growth

  • Severe eczema that doesn't go away.

These non-life threatening allergies may look like other health problems and are often hard to diagnose with allergy testing. Make sure your child sees his or her healthcare provider for a diagnosis.

Severe symptoms of a food allergy

Anaphylaxis is a severe allergic reaction. It is life-threatening. Symptoms can include:

  • Trouble breathing, shortness of breath, or wheezing

  • Feeling as if the throat is closing

  • Hoarseness or trouble talking

  • Swelling of the face, lips, tongue, and throat

  • Cool, moist, or pale blue skin

  • Feeling faint, lightheaded, or confused

  • Nausea, vomiting, or diarrhea

  • Fast and weak heartbeat

  • Feeling dizzy, with a sudden drop in blood pressure

  • Loss of consciousness

  • Seizure

Anaphylaxis is a medical emergency. If you suspect your child is having anaphylaxis, call 911 to get help right away. If your child has an epinephrine autoinjector, use it while you are waiting for the ambulance to arrive. Epinephrine will help stop the symptoms of the allergic reaction. It is life-saving when used for severe allergic reactions. Your child should always have 2 epinephrine autoinjectors with them wherever they go.

How is food allergy diagnosed in a child?

Your child's healthcare provider will make the diagnosis based on a physical exam and a thorough health history. This history should include a list of foods that were eaten before the allergic symptoms.

The healthcare provider will do some tests to make an exact diagnosis. These tests may include the following.

Skin prick test

Skin prick tests are the most common allergy tests. Skin tests measure if there are IgE antibodies to specific allergens such as foods, pollens, or animal dander. A small amount of diluted allergen is put on the skin. The area is pricked or scratched. If a child is allergic to the allergen, a small raised bump that looks like a mosquito bite appears after about 15 minutes. Testing for many allergens may be done at the same time. Skin test results are available right away after the testing is done. Skin prick testing may not be done if your child very recently had a severe reaction, or if he or she has long-term (chronic) hives or severe eczema.

Blood tests

Blood tests for allergies measure IgE antibodies to specific allergens in the blood. The blood test that is most commonly used is called RAST (radioallergosorbent test). Blood tests may be used when skin tests can't be done or if there are still questions about a food allergy after the skin test. A positive blood test does not always mean that your child has a specific allergy. Any positive blood test needs to be explained by a healthcare provider who is familiar with the tests and knows your child's health history. These tests take longer to get results. They may be more costly than other allergy tests.

Note: Neither a skin nor a blood test can determine how severe an allergic reaction will be.

Food challenge test

This test is given by an allergist. He or she gives your child a very small amount of an allergen by mouth. The allergen can also be inhaled. Then your child is watched closely for any reaction. Food challenges are most often done if the allergist thinks your child will be able to eat a food again without a reaction.

How is food allergy treated in a child?

There is currently no medicine to prevent food allergy in children. The goal of treatment is to stay away from the foods that cause the symptoms. It's very important that your child not eat these foods or other similar foods in that food group. If you are breastfeeding your child, talk to your child's allergist about whether or not you need to avoid these foods too.

It may be important to give vitamins to your child if he or she is unable to eat certain foods. Discuss this with your child’s healthcare provider.

Children with food allergies who are at risk of a severe reaction (anaphylaxis) should carry 2 epinephrine autoinjectors at all times. This helps stop the symptoms of severe reactions. Your child's healthcare provider can teach you how to use it. 

Some children may outgrow their allergies. Your child's healthcare provider will discuss follow up testing or food challenges with you. Many allergies may be short-term in children. Your child may be able to eat the food after age 3 or 4. Reintroduce a food only after discussing it with your child's healthcare provider. This is because of the risk of a severe reaction.

If your baby is allergic to milk, treatment may include changing your baby’s formula to a soy formula. If your child has problems with soy formula, your child’s healthcare provider might suggest an easily digested hypoallergenic formula.

What can I do to prevent food allergy in my child?

For many years, it was recommended to delay giving a child certain highly allergenic foods until after age 1 year. But new research shows that for babies at high risk of developing peanut allergy, giving them peanuts between 4 to 6 months can greatly lower the risk for peanut allergy.

Babies are considered "high risk" if they have moderate to severe eczema or egg allergy. Other children who may be at risk include children with food allergies other than egg allergy and those with siblings with peanut allergy. But these lower-risk babies were not included in the recent studies.

If your child is at high risk for peanut allergy, talk with your child's healthcare provider before giving them peanuts. A blood test or skin test for peanut may be advised first.

If your child does not have eczema or other food allergies, you can introduce peanuts at a time that you think is appropriate.

There is no evidence that breastfeeding or formula feeding gives more protection against food allergies. If you are breastfeeding, you don't need to stay away from any particular foods unless your healthcare provider tells you to. Give your baby only infant formula or breastmilk until age 1. Don't give your baby whole milk until after age 1.

Giving your baby eggs early may help prevent egg allergy. Giving other foods early isn't helpful to prevent allergies. But adding foods to a baby's diet within the first year of life is important.

How can I help my child live with a food allergy?

Living with food allergies means not giving your child foods that your child is allergic to. For some children, simply touching the allergen can give them an allergic reaction. Although families can remove the allergen from their home, dining out can be challenging.  

Here are some tips for dealing with your child’s food allergies when you are eating away from home:

  • Know what ingredients are in the foods at the restaurant where you plan to eat. When possible, get a menu from the restaurant ahead of time and review the menu items.

  • Never assume you know the ingredients in an item. Always ask, even if you have been to the restaurant many times before.

  • Let your server know from the start about your child’s food allergy. Ask how the dish is prepared and what's in it before you order. If your server doesn't know this information or seems unsure of it, ask to speak to the manager or the chef.

  • Don't use buffet-style or family-style service. There may be cross-contamination of foods from using the same utensils for different dishes.

  • Don't let your child eat fried foods. The same oil may be used to fry several different foods.

Another tip for dining out is to carry a food allergy card. You can give it your server or the manager before you order food for your child. A food allergy card contains information about the specific items your child is allergic to. It also has additional information such as a reminder to make sure all utensils and equipment used to prepare the meal are thoroughly cleaned before use. You can easily print these cards yourself using a computer and printer.

If your child is eating out with friends and you are not going to be present, give your child a food allergy card (or make sure the adult in charge has one) to give to the server.

Discuss your child’s food allergy with his or her school. Using some of the above strategies at school can be helpful. You may be surprised by how many children at your school have the same or similar allergies.

Your child's epinephrine auto injectors should always be with them. Do your best to avoid the foods that cause the allergy, but always be prepared in case of an accidental exposure or reaction.

Ask your healthcare provider for an anaphylaxis action plan that outlines the symptoms to look for and the steps to take in case of a severe allergic reaction.

Key points about food allergy in children

  • A food allergy is when your child’s body has a bad immune reaction to a certain food.

  • Most allergies are caused by milk, eggs, wheat, soy, tree nuts, peanuts, fish, and shellfish.

  • Symptoms of food allergies may include vomiting, diarrhea, cramps, hives, swelling, eczema, itching, difficulty breathing, wheezing, and lowered blood pressure.

  • Symptoms of milk or soy intolerance may include colic, blood in your child’s stool, and poor growth.

  • The goal of treatment is for your child to stay away from the foods that cause the symptoms. Your child also needs a food allergy treatment plan and epinephrine autoinjectors in case of a severe allergic reaction.

Next steps

Tips to help you get the most from a visit to your child’s healthcare provider:

  • Know the reason for the visit and what you want to happen.

  • Before your visit, write down questions you want answered.

  • At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you for your child.

  • Know why a new medicine or treatment is prescribed and how it will help your child. Also know what the side effects are.

  • Ask if your child’s condition can be treated in other ways.

  • Know why a test or procedure is recommended and what the results could mean.

  • Know what to expect if your child does not take the medicine or have the test or procedure.

  • If your child has a follow-up appointment, write down the date, time, and purpose for that visit.

  • Know how you can contact your child’s provider after office hours. This is important if your child becomes ill and you have questions or need advice.

Online Medical Reviewer: Daphne Pierce-Smith RN MSN CCRC
Online Medical Reviewer: Raymond Kent Turley BSN MSN RN
Date Last Reviewed: 3/1/2019
© 2000-2019 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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