The NHS recommends introducing peanut butter to your baby from around 6 months old, when you start weaning onto solid foods. Peanuts are one of several common allergens that should be introduced early, one at a time and in very small amounts, so you can spot any reaction. Delaying peanut introduction beyond 6 to 12 months may actually increase the risk of your baby developing a peanut allergy.
When to Start
Peanut butter can be offered as soon as your baby begins eating solid foods, which the NHS advises happens at around 6 months. There’s no need to wait until a certain number of other foods have been tried first. The key rule is to introduce allergenic foods one at a time, leaving a few days between each new allergen. This way, if your baby does react, you’ll know exactly which food caused it.
Babies with severe eczema or an existing egg allergy were once considered higher risk and sometimes screened before peanut introduction. Current guidance has shifted away from routine screening. The recommendation now is to introduce peanut around six months regardless, not to delay it. If you’re concerned about your baby’s individual risk, your health visitor or GP can talk you through it.
How to Prepare Peanut Butter Safely
Never give a baby plain peanut butter straight from the jar. It’s too thick and sticky, making it a choking hazard. Instead, thin it down or mix it into something your baby already eats. Here are simple ways to do this:
- Mixed into a puree: Stir a small amount of smooth peanut butter into yoghurt, mashed banana, porridge, or a fruit or vegetable puree. Add water to thin it further if needed.
- Peanut butter powder: Mix peanut flour or powdered peanut butter with water, oatmeal, or applesauce to make a thin sauce. This dissolves more easily than regular peanut butter and is simpler to get to a safe consistency.
Always use smooth peanut butter, never crunchy. Small peanut pieces in chunky varieties are a choking risk. Whole peanuts and chopped peanut pieces should not be given to children under 5. Look for peanut butter with no added salt or sugar, since babies’ kidneys and developing taste preferences do better without either.
How Much to Give the First Time
Start with a very small amount, roughly half a teaspoon of thinned peanut butter mixed into food. Offer it early in the day rather than before bedtime, so you have plenty of time to watch for any reaction. Give it at home where you’re able to observe your baby closely for the next couple of hours.
If your baby tolerates that first taste with no signs of a reaction, you can gradually increase the amount over the following days. Once peanut has been successfully introduced, aim to keep it in your baby’s diet at least twice a week. Regular, ongoing exposure helps maintain tolerance and is an important part of allergy prevention.
What an Allergic Reaction Looks Like
Most allergic reactions in babies are mild and appear within minutes to a couple of hours after eating. Signs to watch for include:
- Swollen lips or face
- A red, itchy rash or hives
- Red, itchy, watery eyes
- Worsening eczema
- Vomiting, tummy pain, or diarrhoea
- Sneezing, a runny nose, or wheezing
A mild reaction, like a small rash around the mouth, doesn’t necessarily mean your baby has a peanut allergy. Food can irritate skin on contact, especially in babies with eczema. But any reaction is worth discussing with your GP before offering peanut again.
Recognising a Severe Reaction
Anaphylaxis is rare but serious. It comes on quickly and can cause difficulty breathing, a swollen tongue or throat, or a widespread raised rash. If your baby shows any of these signs, call 999 immediately and tell them you suspect an anaphylactic reaction. Lay your baby down (or hold them upright if they’re struggling to breathe). If you have an adrenaline auto-injector, use it following the instructions on the device. If symptoms haven’t improved after 5 minutes, use a second injector if available. Do not let your baby stand or sit unsupported, even if they seem to improve.
Severe reactions to a first exposure are uncommon. The vast majority of babies tolerate peanut without any issues at all, and introducing it early is one of the most effective steps you can take to reduce allergy risk.