Rather than a cold bath, I recommend luke warm as you don't want to chill him too quickly. Giving him cold drinks, will help too. Let him sit up with layers of clothing that can go on and off depending how hot he is.
The very high temperature could be a combination of being unwell and being tucked up in bed (childrens internal thermostat is not so well controlled as adults), so unless he has a rash, or cold hands and feet then I would be inclined to wait a few hours to let the Motrin kick in. He could have some junior tylenol in about 2 hours time. Sometimes combining tylenol and ibuprofen gives a better temperature control.
If the fever is sustained despite all the above then give his doctor a ring. If he feels like eating try him with dry toast, or ginger biscuits as these can be better for upset stomaches.
Regards
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