The science-backed way to build your child’s immune resilience
It starts with a runny nose on Monday. By Wednesday, it’s a cough. By Friday, you’re cancelling the weekend, googling “is it croup?” at 2am, and watching your child go down for the third time this term. You haven’t slept properly in a week. The washing has its own ecosystem. And you’re starting to wonder if it’s just your kid.
It isn’t.
Winter does hit some kids harder. And if your child is neurodivergent, the pattern you’re seeing is real, not your imagination. Here’s what’s actually going on, and what moves the needle.
Why winter is harder (especially for neurodivergent kids)
In winter we spend more time indoors breathing the same air. The air itself is drier, which dehydrates the protective mucous lining in the airways and gives viruses an easier ride. There’s less sunlight, which means less vitamin D, one of the immune system’s most underrated levers.
Research drawing on a large Israeli health database of more than 50,000 children also found that kids with ADHD are around 1.4 times more likely to experience respiratory infections than their peers, with elevated rates for gastroenteritis, bronchopneumonia and other infections too.
Why? It’s not one thing. Impulsivity affects hygiene. Comorbid anxiety and chronic stress quietly suppress immune function. Sleep is often harder to come by, and sleep is when the immune system does its repair work. Eating can be a sensory minefield, which narrows the nutrient base. None of this is a parenting failing. It’s a clinical picture that deserves someone looking at the whole picture.
Your child’s immune system, explained without the textbook
Picture your child’s immune system as a tag team of bouncers and detectives.
The bouncers (skin, mucus, the tiny hairs in the nose) work the door. Their job is to stop obvious troublemakers before they get inside. That’s innate immunity: the always-on first line of defence.
The detectives (specialist white blood cells with names like T cells and B cells) work the inside of the building. They learn to recognise specific viruses, remember their faces, and call in backup next time the same one shows up. That’s adaptive immunity, the team that gets smarter with experience.
Roughly 70% of these immune cells live in and around the gut. Not the nose. Not the chest. The gut. The trillions of microbes in your child’s digestive tract act like the training academy, teaching immune cells who’s a threat and who’s just passing through on their way to somewhere else. Which is why what your child eats matters more than any single supplement off the shelf.
What actually works
Sleep, first
The non-negotiable. Toddlers need 11–14 hours, primary-aged kids 9–11, teens 8–10. If sleep is the challenge, and for many neurodivergent families, it is, it’s worth treating properly. Our guide on what sleep supplements actually work is the place to start.
Food, with grace
The big immune nutrients are vitamin D, zinc, iron, vitamin A, vitamin C and fibre. The textbook list of where to find them is oily fish, eggs, red meat, dairy or fortified alternatives, citrus, capsicum, brightly coloured vegetables, oats and legumes. The real-life list is whatever your child will actually eat from that group, served calmly and repeatedly without pressure.
If your child has sensory needs around food, a narrower diet can be the reality. The work isn’t to force the broccoli. It’s to find which forms, textures and contexts your child can safely say yes to, and build from there. Beige-friendly options exist for every nutrient on that list. And you don’t need a perfect plate at every meal. You need consistent exposure across the week, and a child who feels safe at the table.
Hydration
Kids drink less in winter because they don’t feel thirsty in the cold. Mucous membranes need water to function as a barrier. Soups, broths, warm milk and a cup of tea all count!
Movement and outdoor time
Twenty minutes outside in natural light supports vitamin D, circadian rhythm and the gut microbiome. The cold isn’t the enemy. The couch is.
Hygiene that works for the neurodivergent brain
“Wash your hands more” isn’t a strategy that works for the neurospicy brain. Visual cue cards by the sink, a timed song, hand sanitiser stationed at the door, these work better because they remove the executive function load instead of demanding more of it.
Nervous system regulation
Chronic stress raises cortisol, and cortisol suppresses immune function. For anxious kids, the immune playbook includes co-regulation, predictable routines and reducing sensory overload, not just kale.
The supplement question (the short version)
Supplements can help. But they aren’t lollies, and they aren’t a substitute for food.
Supplements can interact with medications, and this matters especially for kids on ADHD stimulants. Vitamin C and other acidic substances (citrus juice, vitamin C powders, effervescent tablets) can reduce the absorption of amphetamine-based stimulants like dexamphetamine and Vyvanse. The fix isn’t to skip the vitamin C, it’s to time it well away from the morning dose. Interactions like this are not rare, and they’re worth checking with someone who knows your child’s full picture before you start, not after.
Vitamins are either fat-soluble (like vitamins A, D, E, K) or water-soluble (like B vitamins and vitamin C). The water-soluble ones flush out daily, which means high-dose vitamin C powders mostly produce very expensive wee, not a stronger immune system. The fat-soluble ones store in the body, which means too much over time can become genuinely harmful. More is not always better.
When to call in some help
It’s worth checking in with 13HEALTH or your GP when something is acute. Persistent fever above 39°C, fast or laboured breathing, dehydration, drowsiness, a rash that doesn’t blanch when pressed, or your gut telling you something is genuinely off. Trust the gut. We did not come this far in evolution to ignore mother instinct.
The Juni appointment is the one you make when the pattern is the problem. When your child has had three courses of antibiotics already this year. When recovery from each bug takes longer than the last. When you’re on first-name terms with the after-hours receptionist. When your neurodivergent child is on stimulants and you want supplement decisions made by someone who understands the interactions. When you tried the multivitamin and the elderberry and the bone broth, and you’re still here, exhausted, reading another article at 11pm.
If you’re starting daycare or kindy and want the foundations in place early, our guide on keeping kids healthy when starting daycare is a good place to begin. If you’re ready for a plan that fits your actual child, their neurotype, their medications, and their very specific feelings about broccoli, book an appointment with one of our paediatric clinical nutritionists and feeding therapists. The first chat is free if you’ve just got questions. If you’re ready to dig in, jump straight to a full appointment.
Your child deserves more than another winter of sick days. You deserve more than another winter on the couch with the Hydralyte.
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Why some kids — especially ND kids — get sick every winter, and the science-backed plan that actually works. From a paediatric clinical nutritionist.
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The Juni Winter Supplement Guide
A clinical nutritionist’s one-page cheat sheet
Three rules before you start
- More isn’t better. Therapeutic doses are precise. For water-soluble vitamins (C, B group), excess flushes out as very expensive wee. For fat-soluble vitamins (A, D, E, K), excess stores in the body and can become harmful.
- Test, don’t guess. Especially for iron, vitamin D and zinc.
- Check interactions — particularly if your child is on ADHD medication, antidepressants, antibiotics, immunosuppressants or thyroid medication. This conversation should happen before the supplement goes in the trolley.
The Big 5 for winter immunity
Vitamin D (fat-soluble)
Regulates immune response, reduces respiratory infection risk. Use D3 (cholecalciferol), liquid or chewable. Pair with K2 where possible. Test levels first; don’t high-dose without supervision because it stores in the body.
Zinc (water-soluble)
Supports immune cell function and may shorten cold duration. Picolinate or citrate is better absorbed than oxide. Take with food. Can reduce absorption of some antibiotics — your pharmacist can advise on timing.
Vitamin C (water-soluble)
Antioxidant, supports white blood cell function. Liposomal or buffered forms are gentler on the tummy.
⚠ ADHD medication alert: acidic substances reduce absorption of amphetamine-based stimulants (Vyvanse, dexamphetamine). Give vitamin C at least one hour away from the morning dose.
Iron
Oxygen transport and immune cell production. Bisglycinate is gentler than sulphate. Do not supplement without testing — too much iron is genuinely harmful and stores in the body.
Probiotics
Support the gut barrier and train immune cells. Strain matters more than total CFU. Look for paediatric-studied strains like Lactobacillus rhamnosus GG and Bifidobacterium lactis BB-12.
The “ask first” list
Elderberry, echinacea, vitamin A, multivitamins — all have a place, all have caveats. Worth a conversation, not a guess.
When to involve a clinical nutritionist
- Your child is on any regular medication
- You’re combining three or more supplements
- They’ve been on the same multivitamin “just in case” for over six months
- They’re neurodivergent and you want a plan that fits their body, not a generic protocol
Book your appointment — first chat free.