Every parent hears them: the confident claims about childhood illnesses passed around family chats and playground conversations. Some are harmless, some are the opposite. Knowing what’s true about the common childhood diseases, and the vaccines that prevent several of them, helps you make calm decisions instead of anxious ones. Here are five diseases Singapore parents ask about most, with the myths pulled apart from the facts.
Five common childhood illnesses, myth versus fact: rotavirus, chickenpox, hepatitis A, hepatitis B and measles. Four of the five are largely preventable by vaccines on or alongside Singapore’s National Childhood Immunisation Schedule. Vaccination and good hygiene do far more than any home remedy, and none of these vaccines causes the diseases people fear.
Check your child’s immunisation records against the schedule at your polyclinic or GP, and catch up any missed doses.
1. Rotavirus
Myth: “It’s just a tummy bug, all children get it and it’s nothing to worry about.”
Fact: Rotavirus is a leading cause of severe diarrhoea and vomiting in young children, and the real danger is dehydration, which can come on fast in a small child. It spreads easily where children gather. An oral vaccine, given as drops in the first months of life, greatly reduces severe cases, and it’s available in Singapore. If your child does catch a tummy bug, the priority is fluids: small, frequent sips of water or oral rehydration solution, and a doctor if they can’t keep fluids down or show signs of dehydration.
2. Chickenpox
Myth: “Better to let your child catch it young and get it over with, so a ‘pox party’ is a good idea.”
Fact: Chickenpox is usually mild, but not always. It can lead to skin infections, pneumonia and, rarely, more serious complications, and a child with chickenpox can pass it to a newborn, a pregnant woman or someone with a weak immune system, for whom it’s dangerous. Deliberately infecting a child is the wrong call. The chickenpox (varicella) vaccine prevents most cases and makes the rest milder, and it’s part of Singapore’s schedule. If your child does get it, keep them home until the blisters crust over, keep nails short to limit scratching, and see a doctor if the rash looks infected or your child is very unwell.
3. Hepatitis A
Myth: “Hepatitis is something adults get, and only from dirty needles.”
Fact: Hepatitis A is a liver infection spread through contaminated food and water, including shellfish and, in past outbreaks elsewhere, frozen berries. Children can catch it, and while many recover fully, it can make them quite unwell. Good hand hygiene and food safety help, and a vaccine is available, worth discussing with your doctor especially before travel to areas where it’s common. It’s a different virus from hepatitis B, and the two are not interchangeable.
4. Hepatitis B
Myth: “A newborn baby doesn’t need a hepatitis vaccine.”
Fact: Hepatitis B is a liver infection that can pass from mother to baby at birth, and an infection caught in infancy is far more likely to become lifelong and to cause serious liver disease later. This is exactly why the hepatitis B vaccine is given so early, with the first dose around birth and further doses in the first months, on Singapore’s schedule. It’s one of the clearest cases where vaccinating a baby prevents a serious adult illness decades down the line.
5. Measles
Myth: “Measles is just a rash, and the MMR vaccine isn’t really necessary.”
Fact: Measles is one of the most contagious diseases known, and it’s far more than a rash. It can cause pneumonia, and in rare cases swelling of the brain, and it’s especially dangerous for babies too young to be vaccinated. The MMR vaccine (measles, mumps and rubella) is safe, highly effective, and given in two doses on Singapore’s schedule. The claim linking it to autism came from discredited research and has been thoroughly disproven. Two doses give strong, lasting protection, which also shields the vulnerable children around yours. Before travelling with a young child, check that their measles protection is up to date.
The pattern behind all five
Across these illnesses the same points hold. Vaccines on the national schedule prevent or soften most of them, and they don’t cause the diseases parents worry about. Basic hygiene, handwashing and safe food and water cut the spread of the rest. And for any sick child, the fundamentals are the same: keep them hydrated, watch how they’re doing rather than fixating on a single symptom, and get a doctor’s help when the warning signs appear. It helps to know how to care for a child’s fever safely, and to keep your child’s shots current, which you can cross-check at your polyclinic or GP.
Common questions
Which childhood diseases are covered by vaccines in Singapore?
Singapore’s National Childhood Immunisation Schedule covers many, including hepatitis B, measles, mumps and rubella (MMR), chickenpox, diphtheria, tetanus, whooping cough, polio, Hib and pneumococcal disease. Rotavirus and hepatitis A vaccines are also available. Check your child’s records at your polyclinic or GP.
Is a “pox party” a good way to build immunity?
No. Deliberately infecting a child with chickenpox risks complications and can spread it to newborns, pregnant women and people with weak immunity, for whom it’s dangerous. The varicella vaccine is the safe way to protect against it.
Does the MMR vaccine cause autism?
No. The original claim came from discredited, retracted research and has been disproven by large studies. MMR is safe and gives strong protection against measles, mumps and rubella.
What’s the difference between hepatitis A and hepatitis B?
They’re different viruses. Hepatitis A spreads mainly through contaminated food and water; hepatitis B spreads through blood and body fluids, including from mother to baby at birth. Both affect the liver, and both have vaccines.
My child caught a tummy bug. When should I worry?
The main risk is dehydration. Give small, frequent sips of water or oral rehydration solution, and see a doctor if your child can’t keep fluids down, has very few wet nappies, is drowsy, or shows other signs of dehydration.
The short version
Most childhood illnesses look scarier than they are, and the ones that really are dangerous are largely the ones we can prevent. Keep your child’s vaccinations up to date, wash hands, handle food safely, and treat a sick child by keeping them hydrated and watching them closely. When you’re unsure, a doctor beats a group chat every time.
More on children’s health
This is general information, not a diagnosis. Guidance is drawn from Singapore’s Health Promotion Board, the National Childhood Immunisation Schedule, the US CDC and the World Health Organization. Confirm your child’s vaccinations and any concerns with your doctor.
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