Tips for Introducing Allergens Before 6 Months
If baby has eczema or an existing food allergy, your doctor may recommend early introduction of peanut, egg, and other common allergens. The pediatric pros at Solid Starts explain how to safely go about it.
Key Points
Some babies benefit from food allergen introduction before 6 months
Talk to your doctor if baby has eczema or an existing food allergy. They may recommend introducing common food allergens like egg and peanut as early as 4 months.
For these babies, delaying introduction increase the risk of food allergies
Don't wait to introduce allergens if baby has eczema or an existing food allergy. The research is clear that early introduction can help prevent allergies from developing.
Start small and keep up exposure to build tolerance
Start with a small taste of the allergen (introduce only one at a time) then repeat again for a few additional meals. Tasting the food for a few days in a row is usually all it takes to know a food is safe. But don’t stop there—keep offering small tastes (ideally twice a week) to maintain tolerance.
Do I need to introduce common allergens to baby at 4 months?
Early introduction of common food allergens is the most effective way to prevent food allergies from developing.
For most babies, allergen introduction can begin at home once they show all of the signs that they are ready to start solids at around 6 months of age. However, some babies have a high risk of food allergy, and their pediatrician or allergist may recommend allergen introduction as early as 4 months of age.
The likelihood of food allergies developing is greatest when babies who are at high risk of food allergies are introduced to common food allergens after 6 months of age.[1] By starting introduction at 4 months of age, you can take advantage of a window of opportunity to introduce allergens at home. However, you need to consult your pediatrician or allergist before you get started if baby already has a known or suspected allergy to any food.
How do you know if baby is at high risk for food allergy?
There are two risk factors that signal baby may be more prone to developing a food allergy:
eczema, especially severe cases
existing food allergy
If baby does not have eczema or any pre-existing food allergy, the risk of developing a food allergy is low, and allergen introduction can wait until baby is developmentally ready to start solids around 6 months of age. After introducing a few foods that are not common food allergens, it’s a good idea to start introducing common allergens to take advantage of the preventative benefits.
The risk of food allergy is high if baby has one or both of the risk factors: existing food allergy, or eczema, especially severe eczema.[2] For these babies, it’s important to introduce common allergens earlier than usual even if other solid foods have not yet been introduced. For babies with eczema, but no history of food allergy, allergen introduction can begin at home if you start early, preferably at 4 months of age. However, for babies who have already exhibited signs of allergy to any food (or for babies older than 6 months with severe eczema), consult your pediatrician or allergist before you get started. They can help you create a plan to safely introduce allergens, order allergy testing, and supervise allergen introduction in the clinic.
Do not delay: even though it can feel scary at first, early allergen introduction is an important opportunity to protect your baby from developing food allergies later on.
Tips for Introducing Allergens Before 6 Months
Begin with peanut or egg.
The evidence for the protective benefits of early allergen introduction is strongest for peanut and egg.[3] For this reason, we recommend starting allergen introduction with one of these foods before introducing other common food allergens.
Offer one food allergen at a time.
Start with one allergen before beginning the introduction of another. This way, if there is a reaction, you’ll know which food was responsible. Just a few days of daily exposure is usually enough to establish that a food is well-tolerated.
Start early in the day.
Pick a day when you are able to closely observe baby, and start shortly after waking or right after a morning nap. This way, it may be easier to contact your doctor for guidance in the unlikely event of a reaction. Most reactions occur shortly after exposure, which is why it is best to introduce allergens when at least one adult can focus their full attention on baby, ideally for at least two hours and without distraction from other children or activities.
Safely position baby on your lap.
Place baby on your lap, with their back against your belly. This way, your body supports baby’s head, neck, and body and helps baby sit upright, which allows the child to focus on the task at hand. Sitting upright with support is key to keeping baby safe at mealtime.
Start with a small amount.
Use the tip of a spoon, a teether, or your finger to offer a small amount of mash or puree, such as mashed egg (make sure it is well cooked) or peanut butter (honey free) that has been thinned with water, breast milk, or formula. You do not need to mix the allergen into a puree of another food. That said, if you’d like to offer purees, and baby seems interested in the food, we recommend following responsive spoon-feeding practices. It is not practical to let baby practice feeding themselves before they are developmentally ready to start solids.
Let baby try to taste.
Hold the spoon or your finger near baby’s face, and wait for a moment to allow baby to observe the food. Baby may lean in with their mouth and try to taste—let them. If they do not budge, slowly move the spoon or finger a little closer to their face, then pause and give them another opportunity. If they hesitate, but otherwise seem engaged, you can gently touch the spoon, teether, or finger to their mouth or tongue, but don’t force it. You want baby to associate food with positive experiences, and forcing food into baby’s mouth does not help achieve this goal. If baby is not actively engaged, turns their head, or pushes the spoon or finger away, they are communicating to you that they want to stop. Take a break or end the meal. You can always start again later.
Trust that a small taste is plenty.
Try not to stress about the quantity consumed. At first, just a small taste is enough to expose baby to the food allergen, and it is not practical to expect a young baby to consume much solid food at this stage. As baby grows, so will their appetite, and they will naturally consume more solid food when it is offered. As time goes on, a modest quantity of allergen (such as 2 grams over the course of a week) can help prevent an allergy from developing as long as it is regularly offered throughout the toddler years.
Watch for signs of an allergic reaction.
After baby has a small taste, move on to your next activity while observing baby. If baby shows no symptoms of an allergic reaction after 10 minutes, proceed with your day. Most reactions occur within minutes (but up to 2 hours) after exposure.
Once an allergen is introduced, maintain exposure.
Aim to regularly offer small tastes of the food allergen. Consistency is key: allergists recommend serving food allergens at least once a week, and ideally 2 to 3 times a week until at least 5 years old. Err on the side of offering the food allergen more frequently when possible.
Frequently Asked Questions
Not at this time. Currently, research supports early introduction of food allergens at 4 months of age primarily for babies at high risk of developing food allergies. For babies who are not at high risk, it is fine to wait to introduce allergens until baby is ready to start solids, typically around 6 months of age. That said, if you are feeling motivated to begin earlier, you can follow the tips in this article.
It is not necessary. You can begin early introduction of egg, peanut, and other common food allergens if baby is at high risk of food allergy, and wait until baby shows all signs of developmental readiness to offer purees and finger foods. If you’d like to offer purees, and baby is showing signs that they are interested in the food, it’s okay to offer the food. We recommend following responsive spoon feeding practices.
Yes. Some babies can show the signs of food allergy very early in life, even when exclusively breastfed or formula-fed. Signs may include itchy rashes, vomiting, diarrhea, or blood in stool.
Despite our best efforts, not all food allergies in babies are preventable. That said, the strongest opportunity for food allergy prevention is to familiarize ourselves with the risk factors for food allergy, and to pursue early and ongoing exposure to food allergens.
No. Unfortunately, exposure via breast milk alone may not be sufficient for allergy prevention.
Do not introduce an allergen immediately before leaving for daycare. Instead, choose a day to introduce an allergen when you are home with baby. Start with a small amount (as small as ¼ teaspoon) of the allergen in the morning, and if baby shows no symptoms of an allergic reaction within a couple of hours, you can offer a slightly larger amount (such as ½ teaspoon) later in the day, such as after baby wakes from an afternoon nap or in the evening. From there, offer the allergen for a third time (up to ~1 teaspoon, but it is perfectly fine if baby doesn’t consume the full amount) the next morning. Ideally, this exposure happens at a time when you are home with baby for a couple hours so you can keep an eye out for any reactions. If that is not possible, try to offer the allergen at least an hour or so before baby goes to daycare or stays with caregivers.
Remember: most IgE-mediated allergic reactions occur within minutes (but can appear up to 2 hours) after exposure, so keep this in mind when arranging your schedule. Once you have offered three exposures of an allergen (and baby has not shown any signs of a reaction), it is important to keep up exposure over time, ideally, 2 to 3 times per week throughout the toddler years. Ongoing tastes can take place any day and time that works for you and your schedule.
It can feel overwhelming to introduce food allergens, particularly if baby is considered "high risk" for the possibility of developing a food allergy. Here are some tips to help you feel a bit more comfortable getting started:
Get on the same page with a partner or other caregiver on how and when you want to introduce food allergens.
Familiarize yourself with symptoms of allergic reactions so you know what it looks like before you offer the first taste.
If your baby is at high risk of food allergy, work with your doctor to create a plan so you know what to do, how to act, and who to contact in case of a reaction.
Lastly, know that you are doing all you can to help prevent food allergies by introducing food allergens early on and serving them often.
