Is Your Child at High Risk of Developing a Food Allergy?

Family history: the genetic component

If you, your partner, or your other children have allergic conditions, your baby faces elevated risk. Allergies have a strong genetic component, though the inheritance pattern isn't straightforward.

When one parent has allergic conditions such as eczema, asthma, hay fever, or food allergies, their child has approximately 20-40% chance of developing allergies. When both parents have allergic conditions, that risk climbs to 40-60%.

However, the specific allergies don't necessarily pass down directly. A parent with pollen allergies might have a child who develops food allergies or eczema instead. What's inherited is the tendency towards allergic responses generally, rather than allergies to particular substances.

Some families carry genetic variations, such as the filaggrin mutation we mentioned earlier, that specifically affect skin barrier function. Children who inherit these mutations are four times more likely to develop eczema, and consequently face higher food allergy risk through that damaged skin barrier pathway.

If you know allergies run in your family, don't despair. This knowledge is valuable because it means you can be more vigilant about prevention strategies from the earliest weeks of your baby's life.

The allergic march: when one condition signals more

Allergists often speak about the "allergic march" or "atopic march," a progression where one allergic condition appears to pave the way for others. This typically follows a predictable sequence:

First, eczema develops in infancy, usually within the first few months of life. Next, food allergies may emerge during the first year or two, most commonly to egg, milk, peanut, or other common allergens. Asthma and allergic rhinitis typically develop in childhood, with asthma often appearing before allergic rhinitis.

Not every child follows this complete progression, of course. Many children with eczema never develop food allergies or asthma. However, understanding this pattern helps explain why a child who already has one allergic condition faces higher risk of developing others.

If your young child has already developed one allergic condition, whether it's persistent eczema, an established food allergy, or even early signs of allergic rhinitis, they're statistically more likely to develop additional allergies. This isn't a guarantee, but it's reason enough to consider which potential prevention strategies may be available.

Subtle signs you might not recognise as risk factors

Beyond the obvious markers like eczema and family history, some subtler signs can indicate elevated food allergy risk:

• Dry, rough skin texture: Even without diagnosed eczema, persistently dry, rough skin that doesn't respond well to regular moisturising can suggest skin barrier dysfunction. This textural change might be more noticeable on darker skin tones where redness is less apparent.
• Immediate family members with multiple allergic conditions: If close relatives have not just one but several allergic conditions, the genetic predisposition is likely stronger. A parent with eczema, hay fever, and asthma, for instance, suggests more significant genetic factors than a parent with hay fever alone.
• Reactions to skincare products: Babies who react to baby products, developing rashes or irritation from various creams, wipes, or bathing products, may have more sensitive, reactive skin that increases allergy risk.

What parents can actually do: prevention strategies that work

Here's the encouraging news, understanding your child's risk isn't just about identifying problems. We now have evidence-based strategies that can genuinely reduce the likelihood of food allergies developing, even in high-risk children.

Treat eczema properly and proactively

This is absolutely crucial and cannot be overstated. Proper, effective eczema treatment isn't just about your child's comfort; it may be one of the most important things you can do to prevent food allergies.

Don't be afraid of prescribed steroid creams when used appropriately under medical guidance. These aren't "bad" for your child; when used correctly, they're safe, effective, and potentially preventing future allergies by protecting that skin barrier.

Our Consultants are currently leading the UK arm of the SEAL study (Stopping Eczema and ALlergy), which is investigating whether proactive treatment of eczema from early infancy can prevent food allergies. As Professor Lack explains: "There is growing evidence that a defective skin barrier in babies manifesting as dry skin or eczema is the gateway to developing food allergies, respiratory allergies, and asthma."

The approach we're studying involves treating the skin barrier before problems become severe, using daily moisturisers and regular, appropriate use of topical steroids to maintain healthy skin, rather than waiting until eczema flares.

For your child, this means:

• Apply emollients liberally and regularly, multiple times daily
• Use prescribed steroid creams as directed
• Bathe your baby in lukewarm water and pat dry gently
• Avoid long, hot baths
• Keep your baby or child’s fingernails short to minimise damage from scratching

Introduce allergenic foods early

Following the landmark LEAP (Learning Early About Peanut) study, we now have strong evidence that early introduction of allergenic foods can prevent allergies from developing, particularly in high-risk infants.

The guidance has changed dramatically in recent years. Previously, parents were advised to delay introducing allergenic foods. Now, the recommendation for infants, and particularly those at high risk (those with eczema or existing food allergies) is to introduce allergenic foods from around four to six months of age, once basic weaning has begun.

This includes:

• Peanut (as smooth peanut butter or peanut puff snacks, never whole nuts in babies and young children, when it is a choking hazard)
• Egg (well cooked)
• Cow's milk 
• Wheat
• Fish
• Sesame

The EAT study (Enquiring About Tolerance), another landmark trial from our clinical team, showed that when babies consumed sufficient amounts of these foods regularly from around three months onwards, there was a significant reduction in food allergy rates, particularly for peanut and egg.

For high-risk babies, we recommend speaking with your GP or allergist before introducing peanut, as some children may need supervised introduction or testing first. However, for most babies, even those with milder forms of eczema, early introduction of allergenic foods at home is safe and beneficial.

Maintain good hand hygiene but don't avoid foods

If your baby is still not eating allergenic foods like peanut butter or eggs, it is sensible to wash hands before handling your baby, particularly if you've been preparing these foods. The key is preventing large amounts of food proteins from getting onto damaged eczema skin whilst still ensuring your baby is consuming these foods appropriately in their diet.

When to seek specialist assessment

You should consider consulting an allergy specialist if:

• Your baby develops eczema, particularly if it is moderate to severe in nature, and in the early months
• You have a family history of allergic conditions 
• Your child has eczema, particularly if it is  difficult to control despite following good skincare routines and using prescribed treatments
• Your baby has already developed one food allergy and you want to prevent others
• You're concerned about safely introducing allergenic foods to a high-risk infant
• Your child has multiple risk factors and you want personalised guidance on prevention

Remember, early assessment doesn't necessarily mean early problems. Often, the most valuable thing a specialist can do is provide reassurance alongside a practical prevention plan tailored to your child's individual risk profile.

Looking ahead with informed optimism

Understanding your child's risk profile for food allergies isn't about anxiety or fatalism. It's about recognising that we're living in an era where prevention is possible.

The research from our LEAP and EAT studies and others worldwide has transformed how we approach childhood allergies. We've moved from a passive stance of waiting to see what develops, to an active approach of identifying risk early and taking evidence-based steps to prevent allergies from occurring in the first place.

The impact has been significant. Researchers compared food allergy rates in U.S. children before and after new infant feeding recommendations were introduced based on the LEAP and EAT studies. Children born after these guidelines were adopted were 43% less likely to develop peanut allergy, and significantly less likely to develop other food allergies. These findings show that introducing common allergenic foods during infancy can help reduce the risk of food allergies later in childhood.

If your child shows signs of elevated risk, whether through early eczema, family history, or other factors, you're not facing an inevitable outcome. You're facing an opportunity to intervene during that crucial developmental window when your child's immune system is still learning how to respond to the world.

Protecting the natural skin barrier, the careful introduction of allergenic foods at just the right time, and the early treatment of eczema before it becomes severe aren't complicated medical interventions. They're straightforward, practical steps that parents can take with appropriate guidance.

If you're concerned about your child's food allergy risk, the team at LACK Allergy Clinic can provide expert assessment and develop a personalised prevention strategy tailored to your child's individual circumstances and risk profile.

Frequently Asked Questions

Does eczema mean my child will develop food allergies?

Many children with eczema never develop food allergies. However, early or severe eczema increases the risk because a weakened skin barrier can allow food proteins to trigger allergic sensitisation.

When should I introduce allergenic foods like peanut or egg to my baby?

Most babies should start allergenic foods such as peanut and well-cooked egg early, once weaning has begun. If your baby has early-onset moderate or severe eczema, speak with a dermatologist or an allergy specialist before introducing peanut.

If allergies run in my family, will my child definitely develop them?

A family history increases risk but does not guarantee your child will develop allergies. What’s inherited is usually a general tendency toward allergic conditions, not a specific allergy.