Suspected heat stroke is an emergency: call your local emergency number and start cooling while help is on the way. During pregnancy, seek medical care promptly for symptoms of heat-related illness. For a newborn, urgent warning signs include a temperature of 38°C (100.4°F) or higher in a baby under 3 months, breathing difficulty, poor responsiveness, seizure, or not feeding. The fever threshold below is from UK NHS guidance; emergency numbers and care pathways differ by country.
When should I call a doctor for heat-related symptoms during pregnancy?
Seek medical care immediately if you are pregnant and develop symptoms of heat-related illness. CDC guidance says pregnancy can make heat illness and dehydration more likely because your body is working harder to cool both you and the developing baby. Dehydration can also interfere with the body’s ability to cool itself through sweating. CDC: Heat and Pregnancy
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Symptoms that need prompt medical advice
Symptoms can include heavy sweating, muscle cramps, weakness, lightheadedness, headache, nausea, vomiting, unusual thirst, or urinating less often. CDC clinical guidance also identifies preterm contractions as a symptom to discuss with a clinician. Signs of dehydration can include cold, clammy skin; dizziness; a rapid heart rate; fatigue; darker urine; and infrequent urination. CDC: Clinical Overview of Heat and Pregnancy
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Move to a cooler place and begin cooling while arranging care. Because pregnancy-specific medical advice matters, contact a clinician rather than relying on a self-directed fluid or electrolyte regimen. Do not wait for symptoms to become severe before seeking advice.
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When to treat it as possible heat stroke
Confusion, altered mental status, slurred speech, seizure, fainting or loss of consciousness, very high body temperature, or hot skin can indicate heat stroke. Call emergency services immediately. In the United States, CDC NIOSH directs people to call 911; elsewhere, call the local emergency number. Stay with the person, move them to a cooler place, remove unnecessary outer clothing, and cool them with cold water, wet skin, or cold wet cloths while help is coming. Do not delay the call to try home treatment. CDC NIOSH: Heat-related Illnesses
When is a newborn’s temperature or behavior an emergency?
For a baby younger than 3 months, a temperature of 38°C (100.4°F) or higher requires urgent medical help under NHS guidance in the UK. Do not wait to see whether the temperature comes down if the baby is in this age group. The threshold is specific to that NHS advice; follow the urgent-care instructions where you live. NHS: When to get urgent medical help for babies and children under 5
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Look at behavior, breathing, feeding, and urine
A newborn cannot reliably tell you they are thirsty, dizzy, or have a headache. Seek urgent assessment if the baby has any of these serious signs identified by NHS guidance:
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- Blue, grey, pale, or mottled skin.
- Fainting, being difficult to wake, or not responding as usual.
- A seizure.
- Not feeding.
- No urine for 12 hours.
CDC advises seeking medical care immediately if a child has symptoms of heat-related illness. If your baby seems seriously unwell or you are worried, seek immediate help rather than waiting for a particular symptom or temperature reading. CDC: Infants and Children and Heat
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What to do while arranging care
- Call for help. For possible heat stroke or a baby with an emergency warning sign, call your local emergency number or follow your local urgent-care pathway. In the US, CDC NIOSH specifies 911. In the UK, use NHS urgent-care guidance; call 999 for an immediate emergency.
- Get out of the heat. Move the pregnant person or baby to a cooler place, away from direct sun or a hot room.
- Start cooling. For suspected heat stroke, remove unnecessary outer clothing and use cool water or wet cloths while emergency help is coming. Stay with the person.
- Keep seeking clinical advice. For pregnancy symptoms, contact a healthcare professional promptly. For a newborn, do not let temporary improvement or a normal temperature reading override serious changes in breathing, feeding, color, responsiveness, or urination.
CDC guidance associates heat exposure during pregnancy, across any trimester, with outcomes including preterm birth, stillbirth, and low birthweight; first-trimester exposure may increase the risk of certain birth defects. These are population-level associations, not a prediction that an individual episode has caused harm. An exposure or symptom is a reason to seek appropriate care, not a basis for estimating an individual outcome. CDC: Clinical Overview of Heat and Pregnancy
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