When dealing with a very high fever in a child, consider the following measures:

1. **Monitor Temperature**: Use a digital thermometer to regularly check the child’s temperature.

2. **Hydration**: Ensure the child drinks plenty of fluids, such as water, electrolyte solutions, or clear soups, to prevent dehydration.

3. **Appropriate Clothing**: Dress the child in lightweight, breathable clothing and keep the room at a comfortable temperature.

4. **Lukewarm Bath**: A lukewarm sponge bath can help lower body temperature. Avoid cold baths, as they may cause shivering.

5. **Medications**: Administer age-appropriate fever-reducing medications, such as acetaminophen or ibuprofen, if recommended by a healthcare provider.

6. **Rest**: Encourage the child to rest as much as possible to support their recovery.

7. **Consult your Doctor**: Seek medical advice if the fever is very high (typically above 104°F or 40°C), lasts more than a couple of days, or is accompanied by other concerning symptoms like difficulty breathing, persistent vomiting, or rash.

Always follow the guidance of your paediatrician for your specific situation.