I kind of wish I could smell a fever after reading this thread. I can tell by looking at my kids if something is brewing. Ds gets glassy eyes. Plus his temples will be hot but his forehead cool a few hours before the fever kicks in. Dd gets the hot temples too but not the glassy eyes, actually, now that I am thinking about it I don't know how I know if she is getting sick, but I know when I look at her that something is brewing.