Our daughter came from the orphanage in so many layers of clothes that my wife photographed them for posterity. This was on a seventy-degree day. The other babies in our travel group came similarly attired.
Did your baby drink its bottle heated to "coffee" temperature?
Ours did, and being totally ignorant, when she'd break out in a sweat, we'd check her temp and "OMG! a fever!", we'd give her Tylenol. After a day of that, we realized her temperature only rose after downing a 100 degree bottle.
So ignorant was I!