It usually starts with one sniffle. Then someone wakes up with a sore throat. A few days later, someone else is coughing. You wash the water bottles, remind everyone to cover their cough, and wonder whether sending them to school in a bubble would be frowned upon.

Cold and flu season can feel relentless and inevitable when you have children.

It's also the time of year when parents start thinking more about immunity. Vitamin C suddenly gets a lot more attention. Vitamin D starts appearing in conversations again. Store shelves fill with products promising "immune support," and it can be difficult to know what actually helps and what simply sounds reassuring.

Vitamins absolutely play a role in a healthy immune system. But they're one piece of a much bigger picture, and understanding that picture can help us make better decisions without expecting a gummy vitamin to somehow create an invisible shield around our kids.

So, where do kids vitamins during cold and flu season fit into the bigger picture? Let’s talk about what children really need.

We tend to think about immunity seasonally because that's when respiratory illnesses become much harder to ignore. Your child's immune system, however, doesn't suddenly switch on when the temperature drops.

The immune system relies on many nutrients to function normally, including vitamins A, C, D, E and several B vitamins, along with minerals such as zinc and selenium. These nutrients participate in different parts of the immune response, from maintaining physical barriers such as skin and mucous membranes to supporting the development and activity of immune cells.

That doesn't mean taking more and more of each nutrient creates an increasingly powerful immune system. Nutrition doesn't work quite that neatly. The more useful goal is making sure children are getting enough of the nutrients their bodies need in the first place.

For most children, that starts with everyday food: fruits and vegetables, whole grains, protein foods and other nutrient-rich choices appropriate for their age.

Of course, anyone who has actually fed a child knows there's often a rather large distance between what children ideally eat and what they actually agree to eat on a Tuesday night.

This is where conversations about children's nutrition need a little real life mixed into them.

You can serve the vegetables. You can offer fruit with breakfast. You can make a beautifully balanced dinner and sit down feeling quite pleased with yourself. Your child can still decide that tonight they eat bread.

Children's appetites and food preferences can change from day to day, and picky eating is especially common in younger children. That's one reason it's more helpful to look at their eating patterns over time than to panic over one nutritionally unimpressive meal.

Cold and flu season doesn't change that.

A multivitamin can be one tool families use to help provide nutrients when a child's diet isn't consistently varied, but it doesn't replace the benefits of food. It's better thought of as part of the routine rather than something we suddenly introduce because someone in Grade 2 started coughing.

If picky eating is an ongoing concern in your house, our guide Why Is My Child Such a Picky Eater? takes a much deeper look at what's normal, why pressure can sometimes make eating harder and how parents can encourage variety without turning every meal into a battle.

Vitamin C probably wins the award for the nutrient most associated with colds.

There's good reason to connect it with immunity. Vitamin C has antioxidant functions and contributes to normal immune function. Children need vitamin C every day, and fruits and vegetables are excellent sources. Citrus fruits may be the famous ones, but strawberries, kiwi, peppers, broccoli and tomatoes can all contribute too.

Where things get muddled is the idea that taking a large amount of vitamin C after a cold begins will make it disappear.

Research hasn't shown that vitamin C prevents colds in the general population. Regular vitamin C intake may modestly shorten the duration of a cold or reduce its severity in some people, but starting vitamin C only after cold symptoms appear hasn't consistently shown the same benefit.

That's quite different from the old idea of waiting until someone sneezes and then reaching for as much vitamin C as possible.

For children, the goal is much simpler: vitamin C is an important nutrient that belongs in their diet throughout the year.

If you live in Canada, you've probably heard about vitamin D and winter more than once.

Our bodies can produce vitamin D when skin is exposed to sunlight, but several factors affect that production, including the season, latitude, time of day, skin pigmentation, age and how much skin is exposed. During Canadian winters, relying on sunshine alone becomes particularly difficult.

Vitamin D also plays an important role in immune function, in addition to its much better-known role in helping the body absorb calcium and maintain healthy bones.

It's tempting to take those two facts and jump to "more vitamin D means fewer colds," but the research is more complicated than that. Studies examining vitamin D supplementation and respiratory infections have produced mixed results, and factors such as a person's existing vitamin D status may influence what researchers observe.

So again, we're back to the same sensible place: children need adequate vitamin D because their bodies need vitamin D. We don't need to turn it into a miracle cold remedy to make it important.

If you'd like to understand the different forms you'll see on labels, our Vitamin D2 vs. D3: What's the Difference? guide explains that both forms can raise vitamin D levels while also looking at some of the differences researchers have observed between them.

When we talk about children's immunity, vitamins tend to get all the attention because they're something tangible we can buy. But nutrients aren't working in isolation.

Children also need enough sleep. The American Academy of Sleep Medicine recommends approximately 10 to 13 hours per 24 hours for children ages 3 to 5 and 9 to 12 hours for children ages 6 to 12. Teenagers generally need 8 to 10 hours.

Those numbers include naps where appropriate, and of course knowing how much sleep your child needs doesn't guarantee they'll enthusiastically head upstairs at bedtime.

Still, regular sleep routines matter for children's overall health and well-being. During busy school months, it can be easy for bedtime to gradually get later while wake-up time stays exactly where it is.

Sometimes supporting your child's health during cold and flu season looks much less like finding one special immune ingredient and much more like getting everyone into pyjamas a little earlier.

If your mother repeatedly told you to wash your hands, she had science on her side.

Many respiratory viruses spread through droplets and particles in the air, but germs can also be picked up from hands and surfaces and transferred when children touch their eyes, nose or mouth. Regular handwashing with soap and water remains one of the basic measures recommended to reduce the spread of infections.

Teaching children to wash properly before eating, after using the bathroom, after blowing their nose and when they come home is one of those decidedly unglamorous health habits that actually matters.

The same goes for teaching them to cough or sneeze into a tissue or their elbow, avoiding sharing cups and utensils, and keeping them home when they're genuinely unwell. No trendy wellness routine makes those basics obsolete.

A children's multivitamin isn't a substitute for sleep, balanced meals, handwashing or medical care when a child is sick.

It is, however, a practical way to help provide important nutrients consistently, particularly when children's diets don't always cooperate with our best intentions.

Nutramin Kids Multivitamin Gummies are designed for children ages 4 and up and provide a range of vitamins and nutrients, including vitamins A, C, D and zinc. They're sugar-free, vegan and made with fruit pectin rather than gelatin, which can make them an easy addition to an established family routine. And routine is the important word here.

Rather than thinking about vitamins as something we pull out when the first cold comes home from school, it makes more sense to think about nutrition as something we support consistently. A child doesn't suddenly need vitamin C because it's November. Their body needed it in July too.

If you're wondering whether your child needs a multivitamin at all, that's also a reasonable question. Our earlier guide Do Children Need Vitamin Supplements? explores when children's diets may already be covering their needs and when parents may want to discuss additional support with their healthcare provider.

Even when we do everything "right," children are still going to get sick sometimes.

That's not a sign that their vitamins failed, that you didn't feed them well enough or that their immune system isn't working. Children encounter viruses at school, daycare, activities and everywhere else little humans gather together.

What we can do is support the things their bodies rely on every day: nutritious food as best we can manage it, adequate sleep, good hygiene habits, movement, hydration and the nutrients they need for normal growth and health.

A multivitamin can fit into that picture without needing to carry the impossible job of preventing every cold that walks through the classroom door.

And perhaps that's a more reassuring way to approach cold and flu season. We don't have to chase every promise of "stronger immunity." We can concentrate on the everyday habits that support our kids all year long, keep the tissues handy, and accept that occasionally someone is still going to bring home a sniffle.