Hey orris,my baby got vaccination on 17 july(3 days before) after 2 months, now she got fever.is it related to vaccine
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2 month baby fever 3 days after vaccination normal post vaccine reaction
Yes, your baby's fever is very likely related to the vaccination. Here's everything you need to know:
Post-Vaccination Fever in a 2-Month-Old - Is It Normal?
Yes, almost certainly vaccine-related. Fever is one of the most common and expected reactions after the 2-month immunizations. It is a sign that your baby's immune system is responding and building protection.
Why Does This Happen?
The 2-month vaccines (DTaP, Hib, PCV13, rotavirus, polio, Hepatitis B booster) trigger an immune response. Part of that response is releasing chemicals called pyrogens, which raise body temperature. This is a healthy, normal process - not an illness.
Timeline
- Fever typically starts within 12-48 hours of vaccination
- Can occasionally appear up to 72 hours (3 days) later - which fits your baby's situation exactly
- Usually resolves within 1-2 days
Your baby's fever appearing on day 3 is still within the expected post-vaccine window.
What to Do at Home
- Infant paracetamol (acetaminophen) - safe for babies over 2 months, every 4-6 hours as needed for fever or discomfort. Ask your pharmacist or doctor for the correct dose based on her weight.
- Keep her well-fed - continue breastfeeding or formula feeding normally
- Dress her lightly, keep the room cool
- Monitor her temperature regularly
When to Worry - See a Doctor Immediately If:
- Fever goes above 38.5°C (101.3°F) in a baby under 3 months (this is an emergency threshold for very young infants)
- Fever lasts more than 3 days after vaccination
- She is not waking for feeds, is unusually difficult to wake up, or very limp
- She is crying inconsolably for more than 3 hours (high-pitched or unusual cry)
- She develops difficulty breathing
- She has a seizure
- The injection site becomes very swollen, red, or warm beyond a small area
Bottom Line
A mild fever 3 days after her 2-month shots is expected and not dangerous on its own. Keep her comfortable, monitor closely, and contact your pediatrician if any of the warning signs above appear - or if you are at all unsure. You are doing the right thing by paying close attention to her. Sources: CHOP Vaccine Safety | Seattle Children's
Important: This is general information. For a baby under 3 months with fever, it is always safest to call your baby's doctor directly, even if vaccine-related fever is the most likely cause.
What temperature is dangerous for a 2-month-old - when should I call emergency?
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2 month old baby fever temperature dangerous emergency threshold pediatric
Here is a clear, complete guide for your 2-month-old:
Fever Temperature Guide for a 2-Month-Old Baby
The #1 Rule for Babies Under 3 Months
Any rectal temperature of 38°C (100.4°F) or higher = call your doctor or go to the ER immediately.
This is a hard medical rule. At 2 months old, your baby's immune system is still immature and cannot fight serious infections on its own. A fever that would be "mild" in an older child can signal something serious in a newborn.
How to Measure Temperature Correctly
| Method | What counts as fever |
|---|---|
| Rectal (most accurate - use this) | 38°C / 100.4°F or higher |
| Armpit (less accurate) | 37.2°C / 99°F or higher |
| Ear (not reliable under 6 months) | Not recommended at this age |
Use a rectal thermometer - it is the only reliably accurate method for babies this young. Ear thermometers are not accurate before 6 months.
🚨 Call Emergency / Go to ER Immediately If:
- Rectal temperature is 38°C (100.4°F) or higher - at this age, do not wait
- Baby is difficult to wake up or unusually limp
- Baby has trouble breathing (fast breathing, nostrils flaring, ribs visible with each breath)
- Crying that won't stop for more than 3 hours, or a high-pitched unusual cry
- Baby refuses to feed for more than one feeding
- Skin looks blue, pale, or mottled (blotchy)
- Baby has a seizure (shaking, stiffening, eyes rolling)
- Stiff neck (can't move head normally)
- A rash that does not fade when you press a glass against it
Important Context for Your Situation
Your baby just had vaccines 3 days ago. Post-vaccine fever is common, but even if you suspect it is vaccine-related, you should still contact your doctor if the temperature reaches 38°C (100.4°F) rectally. At 2 months old, doctors need to rule out serious infections - they cannot assume it is "just the vaccine" without examining her.
Do not give ibuprofen - it is not safe under 6 months. Only infant paracetamol (acetaminophen) is safe at this age, and only at the correct weight-based dose from your doctor.
When in doubt, always call your baby's doctor or go to the nearest emergency department. Trust your instincts as a parent - if something feels wrong, get her seen.
He is very sleepy, the armpit temperature is 101° fahrenheit
Go to the ER Now
101°F armpit + very sleepy in a 2-month-old = go to emergency immediately. Do not wait.
Here is why this is urgent:
On the temperature: Armpit readings run 0.5-1°F lower than the actual core temperature. So your baby's real temperature is likely 101.5-102°F (38.6-39°C) - well above the 100.4°F / 38°C danger threshold for a baby this age.
On the sleepiness: A 2-month-old being "very sleepy" is a serious warning sign on its own. Babies this age should wake regularly for feeds and respond to you. Unusual sleepiness (harder than normal to wake, not responding to touch or voice, limp) can indicate:
- Serious bacterial infection (meningitis, sepsis, urinary tract infection)
- The body being overwhelmed fighting infection
These two signs together - high fever + abnormal sleepiness - require emergency evaluation right now.
What to Do Right Now
- Stop reading - go to the nearest emergency department immediately
- Do not give any medicine and then wait at home hoping it improves
- Tell the ER staff: "My baby is 2 months old, has a fever, and is very difficult to wake" - they will prioritize you
- Bring the vaccination record from July 17 so doctors know which vaccines were given
This is not a "call the doctor in the morning" situation. Please go now. A 2-month-old with fever and lethargy is always treated as an emergency until proven otherwise.
The vaccine lady said that fever will come and has given dolo drops
I understand - and the vaccine nurse was right that fever is expected. Dolo (paracetamol) drops are the correct medicine. But the sleepiness changes everything.
The Problem is Not the Fever Alone - It's the Sleepiness
The nurse gave Dolo drops for the expected fever. That advice was correct at the time of vaccination. She could not predict that your baby would become very difficult to wake 3 days later.
Post-vaccine fever does NOT cause abnormal sleepiness in a 2-month-old.
A vaccine reaction causes:
- Mild fever ✓
- Fussiness / crying ✓
- Slightly more sleepy than usual ✓
- But NOT - very hard to wake, limp, not responding normally ✗
What You Need to Do Right Now
Give the Dolo drops dose IF you haven't already in the last 4-6 hours - then go to the ER.
The Dolo will help bring the fever down during the journey. It does not replace a doctor's examination.
Ask yourself these questions right now:
- Can you wake your baby by calling his name or touching him?
- Is he responding to you, making eye contact?
- Has he fed in the last few hours?
If the answer to any of these is no - this is an emergency. Leave now.
The nurse's instructions were for a normal post-vaccine fever. "Very sleepy" on top of fever at 2 months old goes beyond what any nurse can clear in advance. The doctor needs to examine him to rule out serious infection. Please go today - not tonight, not tomorrow. Now.
Yes to all of it
That is reassuring. If your baby:
- Wakes when you call or touch him ✓
- Makes eye contact and responds to you ✓
- Has fed recently ✓
Then he is not showing the most dangerous signs of lethargy right now.
What to Do Today
Still call your pediatrician or baby's doctor this morning. Don't skip this step. Tell them:
- 2-month-old, vaccinated 3 days ago
- Armpit temperature 101°F
- More sleepy than usual
- Already giving Dolo drops
They will advise whether to bring him in or monitor at home. Most doctors want to see a 2-month-old with these symptoms in person - even if just to reassure you.
While Monitoring at Home
- Give Dolo drops at the correct weight-based dose on time (every 4-6 hours, don't skip)
- Keep him lightly dressed - no heavy blankets
- Try to feed him regularly - fever increases fluid needs
- Check his temperature every 2-3 hours
- Watch him closely
Go to ER Immediately If Anything Changes:
| Sign | Action |
|---|---|
| Won't wake up / very limp | ER now |
| Temperature rises above 38°C / 100.4°F rectally | ER now |
| Stops feeding for one full feeding | Call doctor urgently |
| Breathing fast or labored | ER now |
| Unusual high-pitched cry | ER now |
| Skin looks pale, blue, or blotchy | ER now |
He sounds more settled than I first feared, but please still call your doctor today - a 2-month-old with fever always deserves a professional's eyes on him. Trust your gut - you know your baby best.
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