Constantly Ill Since Starting Nursery? Why It's Normal

This blog only provides tips, tricks and hints and does not replace a doctor visit. For severe symptoms, always consult a doctor.

One cold barely ends before the next one starts. Coughs, a runny nose, a temperature, a tummy bug — and barely a healthy day in between. Many parents call it the nursery bug, and you wonder: Is my child just too prone to illness? The short answer: this wave of infections right after starting nursery is completely normal. It's not a sign of a weak immune system — it's the most intense phase of its training, the first contact with lots of new viruses at once. Here's what to expect in the first months, and when to see your GP anyway.

Important note: This article does not replace professional medical advice. If in doubt or in an emergency, always contact your GP, NHS 111, or call 999.

Why is my child constantly ill since starting nursery?

Because your child's immune system is still inexperienced and meets a large number of new viruses at nursery. There are hundreds of different cold viruses, and young children have no immunity to any of them. The wave of infections right after starting nursery is not a weak immune system — it's the most intense phase of its training.

Think of the immune system as a muscle that has to be trained. With every infection, the body meets a new pathogen and builds a kind of memory for it, so it reacts faster next time. At home your child met only a handful of germs — at nursery, lots of children suddenly bring lots of different viruses together in one room.

That's exactly why infection rates are higher in nursery children than in children cared for at home. Your child has never had these viruses before, so there is no immunity yet. The seemingly endless run of coughs and colds isn't a setback — it's measurable progress.

How many infections a year are normal for a nursery child?

On average, children have 5 to 8 colds a year, and often more once they start nursery. Add tummy bugs and ear infections on top, and it can feel relentless. This isn't a sign that something is wrong — it reflects an immune system that is busy learning to recognise dozens of new pathogens.

In practical terms, during the colder months your child can pick up a new infection every few weeks. Because a single infection often lasts several days to more than a week, the illnesses frequently overlap. It feels like your child is never properly well — but that is simply the normal reality of the first stretch of nursery.

Age	What's considered normal
Children on average	5–8 colds a year
First years of nursery	often more, plus tummy bugs and ear infections
Later childhood	infection rates fall as the immune system matures

Precisely because so many infections stack up in the first months of nursery, it's worth jotting them down — date, symptoms, duration. Mona's pattern view shows you how the infections spread out across the whole settling-in period. That way you can show your GP a clear pattern at the next appointment, rather than relying on vague memories.

Is this the fourth infection now — or the fifth?

The weeks blur together. Mona shows every illness at a glance, so you spot patterns before the GP asks.

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When is constant illness NOT normal anymore?

Most of the time, frequent illness after starting nursery is harmless. What matters is not the number of infections but their severity and whether your child fully recovers in between. Persistent high temperature, a child who never bounces back, or clear emergency signs all warrant a call to your GP.

The number of infections alone is rarely the problem. What counts is the temperature, your child's general condition, and whether they get fully back on their feet between two infections. As a rough guide, a high temperature is 38C or more — and here is when it's worth contacting a doctor:

Babies under 3 months: any temperature of 38C or above — contact a GP or NHS 111 straight away
Babies 3 to 6 months: a temperature of 39C or above
Older children: a high temperature or a sore throat lasting more than 3 days, a cough lasting more than 3 weeks, or earache not improving after 3 days

Remember: behaviour beats the thermometer. A child who drinks and plays despite a high temperature is less worrying than a listless child with a lower one.

🚨 Go to A&E or call 999 immediately if your child:

is unable to swallow fluids or saliva
has any difficulty breathing — fast breathing, or is finding it hard to breathe
has a fit (seizure) for the first time
has a stiff neck and can't touch their chin to their chest
has a rash that doesn't fade when you press a glass against it
is unusually drowsy, unresponsive or hard to wake

Frequent illness almost never means a genuine immune problem. For the detailed warning signs of when something more could be behind it — such as repeated pneumonia, antibiotics that don't work, or failure to thrive — see My Child Is Always Sick: How Many Infections Are Normal?.

When can my child go back to nursery after an infection?

It depends on the illness. For certain infectious illnesses, UK nurseries follow exclusion guidance, and your GP's judgement decides when your child is no longer contagious. For an ordinary cold, the common rule of thumb is: back once they are well enough to join in and have been free of a high temperature for about 24 hours.

Two things decide when your child can return — keep them separate.

1. Certain infectious illnesses. For a number of infectious illnesses, UK nurseries follow national exclusion guidance. Some settings ask your child to stay away for a set time, or until they are clearly no longer contagious. Your GP's judgement is the deciding factor here, and the aim is always to protect the other children.

2. Ordinary coughs and colds. For an everyday cold there is no single universal rule. The common rule of thumb is that your child can go back once they are well enough to take part in the day and have been free of a high temperature for about 24 hours, without needing medicine to keep it down.

Important: The 24-hour rule is a common recommendation, not a fixed law. Every setting has its own policy, and some are stricter. When in doubt, always check with your GP and your nursery.

Some symptoms mean collection almost everywhere: a high temperature, repeated vomiting, and red, sticky eyes. For where the line sits on temperature — and the emergency signs that need urgent care — see Fever in Children: When Is It Dangerous?.

How can I cushion the infections in the first months of nursery?

You can't prevent every infection, and that isn't the goal — this contact with germs is exactly how immunity is built. The single most effective step is regular handwashing. Keep your child home when they're unwell, protect sleep and offer balanced meals, and set up a childcare network early for the many sick days.

First, the most important thing: you cannot prevent every infection, and you don't need to. Every contact with a germ is exactly how your child builds immunity. Let that pressure go — you're not doing anything wrong.

What does help:

Handwashing is the single most effective step — after nursery, before meals, after wiping noses.
Keep an unwell child at home. It protects the other children and spares your own child a second infection on an immune system that hasn't fully recovered.
Sleep and balanced meals support the body's defences — as a foundation, not a magic fix.

Just as important is the organisation around it. The first months of nursery bring a lot of sick days, and they often catch parents off guard.

💡 Tip for the whole team: Plan for the sick days in advance. Build a childcare network of grandparents, friends or neighbours, talk to your employer early about flexible options, and agree who can step in at short notice. Parents who prepare this don't panic at the next infection.

Will it ever get better?

Yes, reliably. The first year of nursery is almost always the hardest. After the first one to two years, the immune system has learned the most common pathogens and infection rates drop significantly. Children who start group care early are often less ill in primary school than those who start later.

The pattern is the same for almost every child: the first year of nursery brings the most infections, the second brings noticeably fewer, and from the third the frequency approaches adult levels. The immune system will get its training — the only question is when.

Until then, remember: the nursery bug is exhausting but temporary. Every infection your child gets through is a building block for a robust immune system. And with each month, you'll grow calmer at judging what's normal and what isn't.

Frequently Asked Questions About the Nursery Bug

How long does the nursery bug last?

The most intense phase is the first one to two years of nursery, while the immune system learns the most common pathogens. After that, infection rates drop noticeably. The first year is usually the hardest, often with a cluster of illnesses in the first weeks after your child settles in. It gets easier from there.

Did my child start nursery too early?

Not necessarily. The wave of infections comes from first contact with lots of germs, not from the age at which nursery starts. Children who start group care early are often less ill in primary school, because their immune system already knows many pathogens. Starting later simply shifts the training in time — it doesn't remove it.

Do I have to keep my child home for every cold?

A mild cold without a temperature is usually no reason to stay home, as long as your child seems well enough to take part in the day. It's different with a high temperature, a noticeably poor general condition, vomiting, diarrhoea or red, sticky eyes. When in doubt, your nursery's policy has the final say — just ask.

Can I strengthen my child's immune system so they get ill less often?

There's no pill that boosts the immune system on demand. Balanced meals, time outdoors and enough sleep are the key foundations — not special supplements or teas. They won't prevent infections completely, but they help the body get over them faster. For specific concerns, your GP can advise you.

When can my child go back to nursery after a temperature?

The common rule of thumb is: back once they've been free of a high temperature for about 24 hours without fever-reducing medicine and are well enough to join in. This isn't a fixed law — your nursery may be stricter. For certain infectious illnesses, your GP's judgement also applies. When in doubt, ask your GP.

My child gets ill again right after each infection — is that normal?

In the colder months, infections often run into each other, because a new virus strikes before the last one has fully cleared. This is usually normal. But do check that your child properly bounces back in between. If they never seem fully recovered between illnesses, have it checked by your GP.

Summary: When Do I Need to Act?

Situation	What to do
Difficulty breathing, first seizure, stiff neck, child unresponsive	Call 999
Baby under 3 months with a temperature of 38C or above	Call 999 or go to A&E
A rash that doesn't fade when pressed with a glass	Call 999
High temperature over 3 days, barely drinking, repeated vomiting	GP the same day or NHS 111
Child never fully recovers between infections	GP — show the history
Frequent but mild infections, child bounces back each time	Normal — observe, track, wait it out