Toddler Vaccines
Hepatitis A Vaccine Side Effects in Toddlers
A tender injection spot, a mild fever and a grumpy day or two are the most toddlers experience after the hepatitis A vaccine.
Written and fact-checked by the ParentVibes editorial team against WHO, IAP, CDC and NHS immunisation guidance. Not yet reviewed by a named clinician.
Quick facts
- Usually given
- 12 months (IAP schedule)
- Doses
- 1 (live type) or 2 (inactivated type)
- Protects against
- Hepatitis A liver infection
- Typical reaction
- Sore spot ± brief low fever
- Usually settles in
- 1–2 days
The hepatitis A vaccine arrives on the schedule around your child's first birthday, when toddlers start sampling food from everywhere and putting the whole world in their mouths. Hepatitis A is a virus that inflames the liver and spreads through contaminated food and water — which makes this vaccine especially relevant in India, where the infection is common.
The good news on the side-effect front: this is one of the gentler vaccines of the second year. Most toddlers have nothing more than a tender arm or thigh and perhaps a slightly off-colour day. Knowing the handful of normal reactions — and the rare signs that need attention — lets you book this dose without worry.
What the hepatitis A vaccine is
Two kinds of hepatitis A vaccine are used in India, and the IAP accepts both. The live attenuated vaccine contains a weakened virus and is given as a single dose at 12 months or later. The inactivated (killed) vaccine contains no live virus at all and is given as two doses, usually at 12 and 18 months, six months apart.
Whichever type your paediatrician uses, the goal is the same: to train your child's immune system to recognise the hepatitis A virus before a contaminated snack, drink or ice gola ever delivers the real thing. Both types have a long track record of being well tolerated in young children.
One dose or two? Check your card
If your child received the live attenuated type, a single dose completes the course. If it was the inactivated type, a second dose about six months later is needed — your vaccination card and paediatrician will confirm which one your child had.
Common hepatitis A vaccine side effects
Reactions, when they happen at all, are mild, short-lived and centred on the injection site or a slightly off day:
Soreness where the injection was given
The arm or thigh can be tender to touch for a day or so, and your toddler may briefly favour the other arm or fuss when the spot is pressed. A little redness or a small firm area is also common.
Low-grade fever
A mild temperature in the first day or two affects a minority of children and usually passes without any treatment beyond comfort and fluids.
Reduced appetite
Some toddlers eat noticeably less on vaccination day and the day after. As long as your child is drinking well, a brief dip in food intake is nothing to worry about.
Tiredness or irritability
A sleepier, clingier or crankier toddler for a day or two is a recognised, harmless response. Expect extra naps and extra cuddle demands, then a return to normal mischief.
Headache (in older children)
Children old enough to describe it sometimes report a mild headache after this vaccine. In toddlers this may simply show up as general grumpiness that settles within a day.
What's usually normal after the hepatitis A vaccine
These are the signs of an ordinary, expected response — no action needed beyond comfort:
- Crying at the time of the injection that settles within minutes with a cuddle or a feed.
- A tender, slightly red or firm spot at the injection site for 1–2 days.
- A mild temperature in the first 24–48 hours that comes down with simple measures.
- Eating less than usual for a day while drinking normally.
- Being clingier, sleepier or more irritable than usual on vaccination day and the day after.
- Absolutely no reaction at all — plenty of toddlers sail through this one unbothered.
How long side effects last
- Soreness, redness or firmness at the site: usually 1–2 days.
- Low-grade fever: typically within the first 48 hours, most often gone within a day.
- Reduced appetite: usually back to normal within a day or two.
- Tiredness and irritability: generally settle by the second day.
- If anything is clearly getting worse rather than better after 48 hours, check in with your paediatrician.
Home care tips
A little comfort care is usually all the aftercare this vaccine needs:
Comfort & the injection site
- Offer extra cuddles, quiet play and an early night — a low-key day helps a grumpy toddler reset.
- A clean, cool, damp cloth held gently on the sore spot for a few minutes can ease tenderness.
- Let your child move the arm or leg freely — normal movement actually helps the soreness settle faster.
- Dress your toddler in soft, loose clothing that doesn't press on the injection site.
Fever, food & fluids
- Keep fluids going — breast milk, water or milk, offered little and often.
- Don't force meals; offer small, familiar foods and let appetite return on its own.
- For a bothersome fever, you can give paracetamol in the dose your doctor has advised for your child's weight — never estimate a dose yourself.
- Dress your child in light layers rather than bundling up; overheating makes a feverish toddler more miserable.
Warning signs — see a doctor urgently
Serious reactions to the hepatitis A vaccine are very rare, but seek urgent care for any of these:
Seek urgent medical care if your child has
- Signs of a severe allergic reaction — difficulty breathing, swelling of the face, lips or tongue, or widespread hives (usually within minutes to an hour of the shot).
- A high fever with your child looking seriously unwell, unusually drowsy or hard to wake.
- A seizure or any unusual jerking movements.
- Refusing all fluids, with fewer wet nappies, a dry mouth or sunken eyes suggesting dehydration.
- Spreading redness, warmth or pus at the injection site rather than a small settling patch.
- Inconsolable crying that goes on for more than a few hours despite comfort.
Call your doctor immediately — or go straight to the nearest emergency department.
🩺 Find a paediatricianBreathing difficulty, facial swelling, a seizure or an unresponsive child means emergency care now — go straight to the nearest hospital.
When to call your paediatrician
Not emergencies, but worth a call or a visit:
- Fever that lasts beyond 48 hours or keeps returning after settling.
- Injection-site redness or swelling that grows after the second day instead of fading.
- Appetite that stays poor beyond a couple of days.
- You're unsure whether your child needs a second dose, or which type of hepatitis A vaccine was given.
- Anything about your child's behaviour that doesn't sit right with you — a quick call costs nothing.
Frequently asked questions
Is the hepatitis A vaccine the same as the hepatitis B vaccine?
No — they protect against two different viruses. Hepatitis B spreads through blood and body fluids and is vaccinated against from birth, while hepatitis A spreads through contaminated food and water and is vaccinated against from 12 months. Your child needs both; one does not cover the other.
Why does my child need this vaccine if hepatitis A is usually mild in children?
Hepatitis A in young children is often mild or silent, but infected children readily pass the virus to older family members, in whom the illness can be much more severe. The infection is common in India because it spreads through food and water, and vaccination protects both your child and the household. Occasionally the illness is significant even in children.
My child had one dose — do they need another?
It depends on the type. The live attenuated vaccine used in India is a single-dose course. The inactivated vaccine needs two doses about six months apart. Check the brand recorded on your vaccination card with your paediatrician to confirm whether a second dose is due.
Can my toddler eat normally after the hepatitis A vaccine?
Yes — no dietary restrictions are needed. A smaller appetite for a day or so is common and fine as long as your child is drinking well. Offer familiar foods without pressure and normal eating usually returns within a day or two.
Can the hepatitis A vaccine give my child hepatitis?
No. The inactivated type contains no live virus at all, and the live attenuated type contains a virus weakened specifically so it cannot cause the illness. Neither type causes hepatitis A infection in healthy children.
My child has a mild cold — should we postpone the vaccine?
A mild cold or slight sniffle without significant fever is usually not a reason to delay — vaccination can go ahead. If your child has a high fever or seems properly unwell, your paediatrician may suggest waiting a few days. When in doubt, ask at the clinic rather than skipping the visit.
Your next steps
Track your baby's vaccines
Enter your baby's birth date to get a personalised vaccine timeline with reminders, so no dose slips.
Open Vaccination TrackerVaccination schedule India
The full IAP-style immunisation chart from birth to the teen years, explained in plain language.
See the full scheduleFind a paediatrician
Worried about a reaction, or due for the next dose? Find a trusted paediatrician near you.
Find a pediatricianRelated vaccine guides
Sources
- WHO — Vaccine safety and side effects
- Indian Academy of Pediatrics (IAP) — Immunization guidelines
- CDC — Possible side effects from vaccines
- NHS — NHS vaccinations and when to have them
- WHO — Hepatitis A vaccines position paper
- CDC — Hepatitis A vaccination
Next review due: 6 January 2027.
Continue on ParentVibes
Medical disclaimer
This page is educational information about common vaccine reactions and is not a substitute for medical advice, diagnosis or treatment. Every child is different — always follow the guidance of your paediatrician or vaccination centre. If your child has trouble breathing, swelling of the face or throat, a fast heartbeat, hives all over, dizziness or weakness soon after a vaccine, or seems seriously unwell at any point, seek emergency medical care immediately. When in doubt, always get your child checked — it is never a waste of anyone's time.
Read our Medical Disclaimer, Editorial Policy and Medical Review Policy.