S.B.
Did the spots look like hives? My son gets hives whenever he is cold. It took us months of allergy testing etc..to figure out what was causing it. Sometimes his whole body would break out and other times just his cheeks or a hand or a foot. We finally figured out it was whatever body part of his was cold would break out and as soon as we warmed him up, they went away. The reason I am bringing this up is because in doing the research about it, I found the same can happen once a baby gets too warm. It isn't a heat rash and he didn't get them until he was almost a year old. The good thing is, usually they will grow out of it.