If you are in a hurry
- Whether your child can wait until morning depends not on how high the fever is, but on fluids, mood (responsiveness), breathing, and skin color
- A temperature of 38°C or higher under 3 months of age, limpness, difficulty breathing, or a seizure lasting 5 minutes or more means seeing a doctor or calling 119 (Japan’s emergency number) without waiting for morning
- A low fever does not always mean safety. Be especially careful when the fever has gone down but your child is limp
Hello. I am Shunichi Gamo, MD, PhD, a board-certified pulmonologist and the director of Sendai Airport North Clinic.
In the middle of the night, or on a Sunday or holiday, your child suddenly runs a fever. The thermometer says 39°C. Your family doctor is closed, and you wonder whether to go to the emergency room or wait until morning… If you are raising children, this is a night you have probably faced at least once.
To give you the conclusion first: whether your child can wait until morning is decided not by “how high the fever is” but by “how your child looks and acts”. In this article I explain the signs that mean you can wait until morning and the signs that mean you cannot when a child has a fever at night or on a holiday, how to use #8000 (Japan’s children’s medical advice phone line), and how to see us at our fever clinic on Sundays and holidays, along with data from research papers.
Since October 4, 2026, our fever clinic is also open on Sundays and holidays
10:00 to 15:00 (no lunch break). No appointment is needed; we accept patients by same-day check-in. We give you your PCR test result the same day. On Sundays and holidays we run the fever clinic only, with no general outpatient care and no IV drips. We are closed on Sunday, October 25, and from November we are generally open every Sunday and holiday. Announcement: fever clinic on Sundays and holidays
Shunichi Gamo, MD, PhD
Director, Sendai International Airport North Clinic
Born and raised locally, he attended Yuriage Elementary School and Yuriage Junior High School in Natori City. After graduating from Tohoku University School of Medicine, he worked at Sendai Open Hospital and Kesennuma City Hospital, and then at Tohoku University Hospital. In April 2021, in the middle of the COVID-19 pandemic, he opened Sendai International Airport North Clinic. Holding to a fever clinic that never turns patients away, he cared for well over 20,000 patients with fever in the two years before COVID-19 was moved to Class 5 under Japan’s infectious disease law.
Society memberships and board certifications
Certified Member and Board Certified Fellow, Japanese Society of Internal Medicine
Board Certified Pulmonologist, Japanese Respiratory Society
Board Certified Allergist, Japanese Society of Allergology
Board Certified Specialist, Japanese Society of Anti-Aging Medicine
PhD in Medicine (Tohoku University)
The short answer: look at the “4 signs,” not the thermometer
When you have to decide at night, it is fine to look at these four things.
- [Fluids]
Is your child drinking, even a little at a time? Is your child passing urine? - [Mood and responsiveness]
Does your child smile when you soothe them, make eye contact, and respond when you call? - [Breathing]
Is there any sign of labored breathing, such as heaving shoulders, the chest or the area below the throat sucking in, or wheezing? - [Skin color]
Is the color normal for your child? Make sure it is not pale, ashen gray, or bluish around the lips
If these four are “just as usual,” you can often wait until morning even with a 39°C fever. Conversely, if even one of them is clearly off, do not wait, even if the temperature is only in the 37s. However, for an infant 3 to 6 months old with a temperature of 39°C or higher, call #8000 even if the baby looks well, and see a doctor first thing the next morning (the NICE guideline also treats this as “needs attention” [1]).
Emergency departments also sort feverish children not only by temperature but by blood oxygen level (SpO2), pulse, breathing rate, consciousness, and hydration. In a study of 350 children aged 5 or younger with fever at an emergency department in India, sorting them with the thinking behind the UK guideline (NICE) caught about 80% (sensitivity 80.3%) of the children who later needed hospital admission at the time of the visit. Put the other way, about 20% were not caught at first, which is why even professionals do not “look once and finish” but follow the course [2]. What is being watched is not “one number” but “the whole picture of the child.”
Dr. GamoEven in the exam room, what I look at first is not the number on the thermometer but your child’s breathing, skin color, and responsiveness.
What signs mean you must not wait until morning? [See a doctor now or call 119]
If even one of the following applies, see a doctor without waiting for morning, even at night or on a holiday. If a seizure lasts 5 minutes or more, your child does not respond when called, or breathing looks very hard, call 119 without hesitation.
- Your baby is under 3 months old and has a temperature of 38°C or higher (see a doctor even if the baby looks well)
- Your child is limp with a dull response or does not make eye contact (if your child does not respond when called or cannot be woken up, call 119)
- Breathing looks hard (heaving shoulders, the chest or the area below the throat sucking in, wheezing, or grunting breaths)
- The lips or face are pale or bluish, or the hands and feet are cold and mottled
- A seizure lasts 5 minutes or more, repeats within a short time, or consciousness does not return after it stops
- Your child cannot keep down any fluids at all, or has not passed urine for half a day or more
- There is a rash of purple or dark-red dots that does not fade when pressed
- Vomiting will not stop, your child cries out in pain when the neck is bent forward or the neck is stiff, light hurts the eyes, or the soft spot on top of a baby’s head (the fontanelle) is bulging
- Your child has a weak or high-pitched cry and cannot be comforted
In the following cases you may be able to wait through the night, but please be sure to see a doctor the next morning.
- Your baby is 3 to 6 months old and has a temperature of 39°C or higher (even if the baby looks well)
- The fever has lasted 5 days or more (we need to check for conditions such as Kawasaki disease)
- Your child has an underlying condition such as asthma or heart or kidney disease
- A fever that had come down has gone up again
A low fever does not always mean safety
In fact, in serious infections the temperature may not rise much, and may even fall. In a study at the emergency department of a US children’s hospital, 385 children judged to have sepsis (a serious condition in which the body’s response to infection becomes uncontrolled and causes life-threatening organ damage) were divided by their temperature at the time they met the sepsis criteria. Children at 37.9°C or lower had more organ damage and similar problems than children at 38.0°C or higher [3].
- Proportion with organ damage at 72 hours
38.0°C or higher: 26.1% / 36.1 to 37.9°C: 53.8% / 36.0°C or lower: 68.2%
Only 22 children were at 36.0°C or lower, which is a small number, but the point is that you cannot say “the fever is not that high, so it must be mild.”
“The fever came down, but my child is limp and looks pale” is, if anything, a warning sign.
Press a nail and watch how fast the color comes back
Here is one more check you can do at home. Press your child’s fingertip or nail for about 5 seconds, release it, and time how long it takes for the white color to turn pink again. This is called capillary refill time, and it is a guide to whether blood is circulating well all the way to the fingers and toes. Usually the color returns in about 2 seconds. The UK NICE guideline treats a refill time of 3 seconds or more as a moderate-risk (amber) sign [1]. It tends to be slower when the hands and feet are cold, so warm the room, and pressing the middle of the chest is another way to check.
In a study of children aged 18 or younger who came to an emergency department with fever and a fast heart rate (tachycardia, a very rapid pulse), the 94 children who went on to shock with low blood pressure within the next 24 hours were more likely than the 186 who did not to have a slow color return at the visit, with an adjusted odds ratio (how much more likely it was, after accounting for other factors) of 3.1 [4].
If the hands and feet are cold and the color comes back slowly, or if the pulse stays fast even after a fever reducer, do not wait until morning.
When can you wait until morning?
On the other hand, in the following situations it is often fine to care for your child at home and wait until morning.
- Even with the fever, your child is taking fluids a little at a time and passing urine
- Your child smiles when you soothe them and reacts to a favorite video or toy
- Breathing is calm and your child can sleep (and wakes up normally when you wake them)
- Skin color is as usual and the hands and feet are warm
- Between fevers, there are times when your child plays happily or laughs
* Whether the fever came down with a fever reducer cannot tell you how serious the illness is (the NICE guideline takes the same position [1]).
However, if your child’s condition changes during the night, make the decision again at that point. “They were fine a little while ago” is not something to base the current decision on.
“39°C” does not mean “severe” [The whole picture matters more than the fever]
A 39°C fever in the middle of the night is truly worrying, isn’t it?
A survey at a children’s emergency department in Turkey (974 patients) found that 68% of visits were for low-urgency conditions, and that when there is a fever, parents tend to feel the illness is more severe than it is [5].
This is not at all saying “so don’t go in.” It only means that a fever makes people anxious. If in doubt, call #8000; if there is a danger sign, go right away. As long as you keep to that line, you will be fine. The American Academy of Pediatrics (AAP) also states that there is no evidence that fever itself makes an illness worse or leaves lasting damage to the brain, and that the goal of treating a fever is not “to bring the temperature back to normal” but “to make your child comfortable” [6].
Do not be swayed by the numbers; look at the four signs above. For decisions at night, that is all there is to it.
If in doubt, call #8000 (children’s medical advice phone line)
If you still cannot tell whether your child can wait, call the children’s medical advice phone line (#8000). From anywhere in Japan, #8000 connects you to the service for your prefecture, where a pediatrician or nurse will advise whether to be seen right away or whether it is fine to watch your child until morning [7]. Hours differ by prefecture, so it is reassuring to check the Miyagi Prefecture hours while your child is well. When you want to check how urgent things are on your smartphone, you can also use the Japan Pediatric Society’s “Children’s Emergency (ONLINE-QQ)” (in Japanese).
- You are not sure what to do
→ Call #8000 for advice - There is a clear danger sign
→ Skip the phone call and go to a night or holiday clinic or an emergency department - A seizure will not stop, your child does not respond when called, or breathing is very hard
→ Call 119
I recommend writing down the number for #8000 and the contact details of your nearest night and holiday clinic, and keeping them on the refrigerator or in your phone.
Care at home [Fever reducers, cooling, and fluids]
If you have decided to wait until morning, please care for your child as follows.
- [Fever reducer]
The medicine we basically use for children is acetaminophen. Acetaminophen (for example Calonal) can bring the temperature down, and when your child feels better it is easier to drink and sleep. There is no rule such as “use it at a certain temperature”; the time to use it is when your child is miserable with the fever or cannot sleep or drink. The dose is based on body weight, so use prescribed medicine (including suppositories) exactly as directed, and use over-the-counter children’s acetaminophen according to the age and weight table on the box, leaving about 6 hours since the last dose. For a baby under 3 months, do not give it on your own judgment; see a doctor first. Do not use adult over-the-counter medicine or a sibling’s medicine - [Cooling]
While your child is shivering with chills, keep them warm. Once the fever has peaked and your child feels hot, dress them lightly and just cool the neck, armpits, and groin gently. Be careful with cooling sheets: on a baby they can come off and block the mouth or nose - [Fluids]
Give oral rehydration solution or barley tea in small, frequent amounts. Drinking a lot at once makes vomiting more likely, so start with one spoonful - [Notes]
The course of the fever, the time you gave a fever reducer, how much your child drank, and how many times they passed urine. These are very helpful at the next day’s visit
If your child vomits and cannot keep fluids down, please also see our article on what to do when a child cannot drink because of fever and vomiting.
If a febrile seizure happens
Most febrile seizures stop within a few minutes and almost always leave no lasting effects. Even so, anyone would panic when their own child has a seizure right in front of them. Just remember the following order.
- First, look at the clock (note the start time; if you can, film it on your phone)
- Lay your child on a flat surface and turn the face to the side (so that vomit does not block the airway)
- Do not put fingers or a towel in the mouth, and do not shake the body
- If it lasts 5 minutes or more, repeats within a short time, or consciousness does not return after it stops, call 119
If it is your child’s first seizure, your child is under 1 year old, the seizure affects only one side of the body, or your child stays dazed for a long time after it stops (30 minutes or more is a guide), see a doctor right then, even at night. If it is the second or later seizure, stopped within a few minutes, and consciousness and skin color quickly went back to normal, it is fine to consult #8000 and be seen the next morning. Note that fever reducers cannot prevent seizures [1].
At daybreak, or on a Sunday or holiday, come to our fever clinic
Our clinic does not see patients at night. We are also closed on Thursdays and on closed Sundays (most recently October 25). If there is a danger sign during the night, please use #8000, a night or holiday clinic, or an emergency department. Then,
“We were able to wait until morning, but I would like this fever properly checked”
when that is how you feel, please come to our fever clinic. Our policy is not to turn away anyone who wants to be seen at the fever clinic (depending on the symptoms, we may direct you to a more suitable medical facility). We also see young children with fever.
| Day | Hours |
|---|---|
| Mon, Tue, Wed, Fri, Sat | 9:00 to 12:00 / 14:00 to 18:00 |
| Sundays and holidays (from October 4, 2026) | 10:00 to 15:00 (no lunch break, fever clinic only) |
| Thursday | Closed |
Among Sundays and holidays, we are closed on Sunday, October 25, and from November we are generally open every Sunday and holiday. For details, please see the announcement about the fever clinic on Sundays and holidays.
How your visit works (no appointment needed)
- Pre-visit questionnaire (optional) → same-day check-in with the QR code at the fever clinic entrance (required) → wait in your car → we call you by text message or phone
- On Sundays and holidays, after check-in your insurance card (My Number insurance card, eligibility certificate, and so on) is verified at the general outpatient entrance
- For detailed steps, please see the page on the fever clinic pre-visit questionnaire and same-day check-in
Patients are generally seen in order of check-in, but the order may change depending on how severe the symptoms are. We give you the PCR test result the same day. Many children can do the saliva PCR test from around age 3 (how to take the saliva PCR test).
Please note that we cannot give IV drips on Sundays and holidays. If an IV drip seems likely to be needed, for example when your child cannot take any fluids and is limp, please go to a medical facility that can give IV drips.
Dr. Gamo“It wasn’t serious enough to take them out in the middle of the night, but I’m still worried.” That alone is reason enough to see a doctor. Please do not hesitate to come.
Frequently asked questions
- My child has a 39°C fever in the middle of the night. Should I go to the emergency room right away?
-
The height of the fever alone does not decide the urgency. For a baby under 3 months with a temperature of 38°C or higher, see a doctor right away; for a baby 3 to 6 months old with a temperature of 39°C or higher, consult #8000 and see a doctor first thing the next morning. If your child is taking fluids, smiles when soothed, and is breathing calmly and sleeping, it is often fine to watch until morning. If your child is limp with a dull response, seems to be having trouble breathing, or looks pale, see a doctor even at night, whatever the temperature. If in doubt, you can consult #8000.
- Can a baby under 3 months old with a fever wait until morning?
-
No, please do not wait. If a baby under 3 months old has a temperature of 38°C or higher, see a doctor right away, even if the baby looks well, whether it is night or a holiday.
- The fever does not come all the way down even after a fever reducer. Is it not working?
-
Acetaminophen (for example Calonal) is a medicine that lowers the temperature and eases discomfort. If 39°C comes down to the 38s and your child can drink and sleep, that is a sign it is working. However, how far the fever drops does not tell you how serious the illness is. If your child is still limp with a dull response even after taking it, please see a doctor.
- Can I bring my child to the fever clinic on Sundays and holidays?
-
Yes. Since October 4, 2026, we run the fever clinic on Sundays and holidays from 10:00 to 15:00 (no lunch break). No appointment is needed; we accept patients by same-day check-in with the QR code at the fever clinic entrance. We are closed on Sunday, October 25. On Sundays and holidays we do not offer general outpatient care or IV drips.
- The fever is gone but only the cough continues. Should I see a doctor?
-
If a cough lasts 2 weeks or more even after the fever is gone, mycoplasma, whooping cough (pertussis), or asthma may be hiding behind it. Please consult us at the fever clinic (including Sundays and holidays) or at a weekday general outpatient visit (our article on mycoplasma).
Summary [Use the “4 signs” for decisions at night]
- Whether your child can wait until morning depends not on how high the fever is, but on fluids, mood (responsiveness), breathing, and skin color
- A temperature of 38°C or higher under 3 months of age, limpness, difficulty breathing, or a seizure lasting 5 minutes or more means seeing a doctor or calling 119 without waiting for morning
- A low fever does not always mean safety. Be especially careful when the fever has gone down but your child is limp
- If in doubt, call #8000. If there is a danger sign, go without making the call first
- When morning comes, come to our fever clinic (closed Thursdays on weekdays; Sundays and holidays 10:00 to 15:00 with no appointment needed; closed October 25)
A child’s fever in the middle of the night makes you flustered no matter how many times you have been through it. If you hold on to just the rough outline of the “signs you can wait” and the “signs you cannot wait,” you will be fine. When morning comes, please leave the medical care to us.
That’s all.
Disclaimer
This article is intended to provide general medical information and does not replace an examination, diagnosis, or treatment by a doctor. The content is based on medical knowledge at the time of publication, but the appropriate response differs from person to person. If you are worried about your symptoms, please consult a medical institution.
References
- National Institute for Health and Care Excellence. Fever in under 5s: assessment and initial management (NG143). NICE guideline. 2019. https://www.nice.org.uk/guidance/ng143
- Vadakkeveedan AA, Poovathumparambil V, Senapathy RT, Shaji IM, Padiyath R, Jayachandran AK, et al. Pediatric simple triage score: A simplified approach for triaging pediatric patients with fever in the emergency department. Turk J Emerg Med. 2025;25(1):25-31. doi:10.4103/tjem.tjem_101_24 PMID: 39882096
- Straus M, Morrison JM, Khalaf R, Fierstein J, Miller A, Young D, et al. Triage Temperature and Timeliness of Sepsis Interventions in a Pediatric Emergency Department. West J Emerg Med. 2025 Nov;26(6):1719-1728. doi:10.5811/westjem.47379 PMID: 41380064
- Baker AH, Mazandi VM, Norton JS, Melendez E. Emergency Department Sepsis Triage Scoring Tool Elements Associated With Hypotension Within 24 Hours in Children With Fever and Tachycardia. Pediatr Emerg Care. 2024 Sep;40(9):644-649. doi:10.1097/PEC.0000000000003153 PMID: 38471759
- Pehlivanturk-Kizilkan M, Ozsezen B, Batu ED. Factors Affecting Nonurgent Pediatric Emergency Department Visits and Parental Emergency Overestimation. Pediatr Emerg Care. 2022 Jun;38(6):264-268. doi:10.1097/PEC.0000000000002723 PMID: 35507379
- Section on Clinical Pharmacology and Therapeutics, Committee on Drugs, Sullivan JE, Farrar HC. Fever and antipyretic use in children. Pediatrics. 2011 Mar;127(3):580-7. doi:10.1542/peds.2010-3852 PMID: 21357332
- Ministry of Health, Labour and Welfare. About the Children’s Medical Advice Phone Service (#8000) (in Japanese). Ministry of Health, Labour and Welfare website. Accessed October 2026. https://www.mhlw.go.jp/topics/2006/10/tp1010-3.html
Related articles on fever
For the fever clinic on Sundays and holidays, see the announcement about the fever clinic on Sundays and holidays; for how to visit, see the page on the fever clinic pre-visit questionnaire and same-day check-in.
