6–14 Week Vaccines
PCV (Pneumococcal Vaccine) Side Effects in Babies
A sore, swollen thigh and a fussy, sleepy day with a mild fever are the usual PCV reactions — most babies are back to normal within a day or two.
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
- 6 & 14 weeks + 12–15 month booster
- How it's given
- Injection into the thigh
- Protects against
- Pneumonia, meningitis, ear infections
- Typical reaction
- Sore thigh, low fever, fussiness
- Usually settles in
- 1–2 days
PCV (pneumococcal conjugate vaccine) protects your baby against pneumococcus — a common bacterium that causes serious pneumonia, meningitis, blood infections and many ear infections in young children. It is one of the most valuable vaccines on the schedule, and in India it is given as injections into the thigh in early infancy with a booster in the second year.
PCV is a little more likely to cause a noticeable reaction than some other baby vaccines, so it helps to know what to expect. A sore leg, a mild fever and a grumpy, sleepy day are common and usually mean the immune system is responding well. These effects are almost always short-lived, and simple comfort measures at home are usually all your baby needs.
What the pneumococcal vaccine is
PCV is a conjugate vaccine — it links pieces of the pneumococcus bacterium to a carrier protein so that even a young baby's immune system can build strong, lasting protection. It is an inactivated vaccine and cannot cause pneumonia or any pneumococcal infection.
In India, PCV is given as two doses in the primary series (commonly at 6 and 14 weeks) followed by a booster at 12–15 months. It is usually given at the same visit as other injections such as pentavalent and IPV, which is worth remembering because fever tends to be a little more common when several vaccines are given together at one appointment.
It cannot cause pneumonia
PCV contains no live bacteria — it can't give your baby pneumonia or a pneumococcal infection. Any fever afterwards is the immune system building protection, not an infection from the vaccine.
Common PCV side effects
PCV is moderately reactogenic, so a bit more reaction than usual is expected. Most effects appear within a day of the shot.
A sore, red or swollen thigh
The injection site is often tender and may look red or slightly swollen. Your baby may protest when the leg is touched or moved. This is the most common PCV effect and settles over a day or two.
Low-grade fever
A mild temperature in the first 24 hours is common. Fever is a little more likely when PCV is given together with other vaccines at the same visit — the combination, not PCV alone, often drives it.
Fussiness and irritability
Many babies are grumpier or more clingy than usual on the day of the vaccine and sometimes the day after. Extra comfort, feeds and rest usually see them through.
Sleepiness or a change in sleep
Some babies are noticeably drowsier than usual after PCV, while a few sleep less well. Both are common and settle within a day or two.
Reduced appetite
A dip in feeding on vaccination day and the day after is typical. Offer smaller, more frequent feeds; appetite usually returns to normal quickly.
More reaction, still normal
It's normal for PCV to cause a bit more fuss than some other shots. A sore leg, a mild fever and a cranky day usually mean your baby's immune system is doing exactly what the vaccine intends.
What's usually normal after PCV
PCV tends to make itself felt more than gentler vaccines. These are the signs of a normal, healthy response:
- A tender, red or slightly swollen thigh at the injection site for 1–2 days.
- A low-grade fever in the first 24 hours, especially if other vaccines were given too.
- A fussy, clingy or grumpy mood on vaccination day and sometimes the next day.
- More sleepiness than usual, or a night of less settled sleep.
- Feeding a little less for a day, then returning to normal.
- Your baby gradually brightening and returning to their usual self within a day or two.
| Time after PCV | What you'll typically see |
|---|---|
| First few hours | Crying at the shot, then a sore, tender thigh |
| Same day | Low-grade fever, fussiness, sleepiness or less feeding |
| Next day | Effects easing; leg still slightly sore |
| 2–3 days | Back to normal feeding, mood and sleep |
How long PCV side effects last
- Soreness, redness and swelling at the site: usually 1–2 days, occasionally up to three.
- Low-grade fever: typically within the first 24 hours and gone within a day or so.
- Fussiness and disturbed sleep: usually settle within a day or two.
- Reduced appetite: generally back to normal within a day.
- If fever or soreness clearly worsens after the first two days rather than easing, have your baby checked.
The pattern to expect
PCV reactions usually peak within the first day and then steadily improve. A reaction that keeps getting worse after 48 hours, rather than settling, is worth a call to your paediatrician.
Home care after PCV
Comfort is the main job. A little planning around feeds, rest and the sore leg makes the day easier for both of you.
Fever & comfort
- Offer plenty of feeds — breast milk or formula — to keep your baby hydrated and soothed.
- Dress your baby in light layers and keep the room comfortably cool rather than warm.
- If your baby is distressed by fever or a sore leg, use paracetamol only in the dose your doctor has advised for your child's weight — never aspirin.
The sore leg & rest
- Handle the injected leg gently; a cool, clean, damp cloth on the site for a few minutes can ease soreness.
- Gentle movement and cycling of the legs during play can reduce stiffness.
- Allow extra rest and cuddles — a quieter day helps a grumpy, sleepy baby settle.
Warning signs — see a doctor urgently
Serious reactions to PCV are rare, but seek urgent medical care if you notice:
Seek urgent medical care if your child has
- A very high fever of 40°C or above.
- Inconsolable, high-pitched crying that continues for more than about three hours.
- Signs of a severe allergic reaction — difficulty breathing, swelling of the face, lips or tongue, or widespread hives (usually within minutes to an hour).
- A fit or seizure, or your baby becoming floppy, pale and unresponsive.
- Your baby looking seriously unwell, very drowsy, or much harder to wake than usual.
- Spreading redness, heat or pus at the injection site, or a leg too painful to move.
Call your doctor immediately — or go straight to the nearest emergency department.
🩺 Find a paediatricianIf your baby has trouble breathing, facial swelling, a seizure or is unresponsive, go to the nearest emergency department immediately.
When to call your paediatrician
Not an emergency, but worth a call or a visit:
- Fever that lasts beyond 48 hours or keeps climbing despite comfort measures.
- The thigh stays swollen, red or painful, or gets worse after the first two days.
- Feeding stays noticeably reduced beyond the first day, with fewer wet nappies.
- Your baby remains unusually irritable or sleepy for more than a couple of days.
- Anything that leaves you uneasy — a quick call for reassurance is always reasonable.
Frequently asked questions
Why is my baby so fussy and sleepy after the PCV vaccine?
PCV is a bit more reactogenic than some other baby vaccines, so a grumpy, clingy or sleepy day is common and usually means the immune system is responding. Extra feeds, cuddles and rest help. It typically settles within a day or two.
Is a swollen, red thigh after PCV normal?
Yes. A tender, red or slightly swollen injection site is the most common PCV effect and usually eases within one to two days. Handle the leg gently and try a cool damp cloth. See a doctor if the swelling spreads, feels hot, or the leg becomes too painful to move.
My baby got a fever after PCV — is it because of the vaccine?
A low-grade fever in the first 24 hours is a common PCV reaction, and it's a little more likely when PCV is given with other vaccines at the same visit. Care for your baby's comfort, and treat a fever of 40°C or above, or a baby who seems seriously unwell, as a reason to seek urgent care.
Can PCV give my baby pneumonia?
No. PCV is an inactivated conjugate vaccine and contains no live bacteria, so it cannot cause pneumonia or any pneumococcal infection. It only teaches the body to defend against these germs.
Can I give paracetamol before the PCV shot to prevent a reaction?
Don't give fever medicine routinely before a vaccine unless your doctor advises it. If your baby becomes uncomfortable afterwards, paracetamol in the dose your doctor has advised for your child's weight can help — never give aspirin to a child.
Does my baby really need the PCV booster in the second year?
Yes. The 12–15 month booster tops up and prolongs the protection built in infancy against pneumonia, meningitis and ear infections. Skipping it leaves protection weaker over time, so keep the booster appointment.
Your next steps
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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 — Pneumococcal conjugate vaccines position paper
- CDC — Pneumococcal vaccination
- NHS — Pneumococcal vaccine side effects
Next review due: 6 January 2027.
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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.
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