Introducing allergens safely when weaning your baby
- Jul 8
- 2 min read
Weaning is an exciting step, but for many parents it comes with a nervous question: how do I introduce foods like egg and peanut without causing a reaction? It is a fair worry. The reassuring news is that current evidence has changed how we think about this, and there is a calm, sensible way to go about it.
Why introducing allergens early can help
For years, parents were told to hold off on common allergy foods. The advice has now changed. Research shows that introducing these foods earlier, rather than delaying, can actually help reduce the chance of a child developing an allergy. So once your baby is ready for solids, usually around six months, these foods can be part of the journey.
The common allergens to include
The foods most often linked to allergy are:
Cow's milk (in cooking)
Egg
Peanut (as smooth peanut butter or a thinned paste, never whole nuts)
Tree nuts (ground or as a smooth butter)
Soya
Wheat and other gluten grains
Fish and shellfish
Sesame
How to do it safely
A few simple principles make this much less stressful:
Introduce one new allergen at a time, so if there is a reaction you know the cause.
Start with a small amount, then build up over a few days if all is well.
Offer new allergens earlier in the day, not last thing at night, so you can watch your baby.
Once a food is in and tolerated, keep it in their diet regularly. Dropping it for weeks can undo the benefit.
Always make foods safe for the age: smooth, soft and never a choking risk.
What a reaction can look like
Most reactions are mild: redness around the mouth, a few hives, or a bit of tummy upset. Watch for anything more serious such as swelling of the lips or face, widespread hives, vomiting, or any difficulty breathing. If you ever see breathing problems or floppiness, treat it as an emergency.
Extra care for some babies
If your baby already has moderate or severe eczema, or a known food allergy, they have a higher chance of other allergies. It is worth getting tailored advice before you start, rather than holding back out of worry.
Feeling confident about weaning
You should not have to feel anxious at every mealtime. A nurse-led consultation can talk you through a step-by-step weaning plan that suits your baby, so you can introduce these foods with confidence, alongside your GP and health visitor.
This blog is general guidance and not a substitute for medical advice. If your baby has severe eczema or a known allergy, seek personalised advice first. Call 999 if your child has any difficulty breathing or a severe reaction.
