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1 year old has temperature of 39.7 after vaccine

6 replies

Sabsabsy · 06/05/2026 22:25

Baby had his 1 year MMR & 1st dose chicken pox vaccine a week ago and now has a temperature of 39.8 in one arm and 38.9 in the other arm. Temperature hasn’t come down much with calpol. Also had some rapid breathing when asleep. Should we go to A&E or let him sleep it off and see how he is in the morning?

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2boyzNosleep · 06/05/2026 22:27

How long ago did he have calpol? If its been an hour since calpol, then give ibuprofen.

Children breath faster when they have a fever.

You know him best, if youre concerned ring 111

Breezeee · 06/05/2026 22:28

I would call 111 for advice if the temperature doesnt go down with calpol within 30 mins to an hour.

HollyIvy89 · 06/05/2026 22:28

Call out of hours if worried. How about a cold flannel also and reassess x

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Pyjamatimenow · 06/05/2026 22:29

I would be giving ibuprofen.works better for fevers. My daughter is prone to high fevers and was ill after all the jabs. If you’re worried though ring 111 for advice

Qwickwit · 06/05/2026 22:36

Paeds nurse here.

When you say temperature hasn't come down much, how much is 'not much'?

How long ago did he have the Calpol, and has he had any ibuprofen?

I would give him some ibuprofen and check his temperature again in an hour, if it comes down then keep going with the Calpol/ibuprofen, if it's still not coming down then go and get him checked over. The actual numbers are less concerning than whether they respond to medication - some kids just consistently spike really high if they have a fever and there's no correlation between level of sickness and the number on the thermometer. My daughters temperature is either normal, or 39.9, no middle ground, even for just a mild viral illness. I've also seen septic patients with a temperature of 38.1

The quick breathing is likely because he's hot, as long as it's just fast and doesn't look like he's struggling to breathe, but I obviously can't see him and you know him best so if you're concerned then get him checked.

Sabsabsy · 06/05/2026 23:05

Thanks everyone. His temp has come down from 39.9 to 38.5 and 38.9 to 37.9, so I think we’ll keep him home tonight and let him try to sleep it off with calpol and neurofen. I’m pretty sure that if I called 111 they would tell us to go to A&E but only because that’s what they always say!

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