Vaccination day is stressful for parents and babies alike. The injection itself is over in seconds, but the hours afterwards can bring a sore leg, a mild fever, and a clingy, unsettled baby. The good news is that most post-vaccination discomfort is mild and short-lived — and there is a lot you can do to help your baby feel better.
For more guidance on keeping your little one comfortable and healthy, visit the Healthy Baby Guide homepage.
What Is Normal After a Vaccination?
After a routine vaccination, it is common for babies to be sleepier than usual, feed a little less, or cry more. The injection site may be red, slightly swollen, or tender to touch. Some babies develop a mild fever within 24 hours. These are signs that the immune system is responding — they are unpleasant but normal, and they usually pass within one to two days.
Serious reactions are very rare. However, seek medical help straight away if your baby has a high fever that does not come down, is unusually drowsy or difficult to wake, has a seizure, or develops swelling of the face or lips, or breathing difficulty.
Comforting Your Baby in the First Few Hours
Hold and cuddle them
Nothing beats close contact. Holding your baby skin-to-skin, rocking them gently, and speaking softly all help lower their stress. Many clinics encourage a feed straight after the injection — breastfeeding or a bottle gives comfort and a welcome distraction.
Sooth the sore spot
A clean, cool, damp cloth held gently against the injection site for a few minutes can ease soreness and swelling. Do not rub the area and do not apply creams unless your doctor advises it. Loose clothing that does not press on the leg or arm also helps.
Keep feeds going
Offer feeds more often than usual if your baby wants them. Fluids are especially important if they have a mild fever. Do not worry if their appetite dips for a day — it usually returns quickly.
Managing a Mild Fever
A temperature up to around 38°C after a vaccination is common. Dress your baby in light clothing, keep the room comfortably cool, and offer extra feeds. Infant paracetamol or ibuprofen can help if your baby is uncomfortable, but always follow the dosage on the label for your baby’s age and weight, and check with your doctor or pharmacist first if you are unsure.
Never give aspirin to a baby. If the fever rises above 39°C, lasts more than 48 hours, or your baby seems very unwell, call your doctor.
Helping Your Baby Sleep After Vaccinations
Many babies sleep more than usual after their jabs — let them. Extra sleep is part of recovery. Others are restless and wake more often. Keep the evening routine calm and familiar, and be ready for a few extra night wakings. It is fine to hold and comfort your baby more than usual for a day or two; you will not “spoil” them by responding to their needs.
Tips for the Next Vaccination Visit
- Book the appointment at a time when your baby is usually settled, not when they are due a nap.
- Bring a favourite toy or blanket for comfort.
- Feed your baby shortly before or after the appointment if the clinic allows it.
- Ask the nurse which side the injection will be on, so you can plan clothing.
- Keep the rest of the day quiet — skip busy outings and let your baby rest.
When to Call the Doctor
Call for advice if your baby’s fever lasts more than two days, the injection site becomes very red, hot, or swollen, your baby refuses all feeds, or you are worried for any reason. Parents know their baby best, and it is always better to ask than to worry in silence.
A Short Rough Patch Worth Going Through
A day or two of fussiness is a small price for protection against serious diseases. With cuddles, cool cloths, plenty of fluids, and patience, most babies are back to their usual selves within 48 hours. And each vaccination visit tends to get easier — for you as well as for your baby.
