that sounds like a whole lot of bull to me.
does the poster live in a more northern climate? because ds got hives last week and they were terrible, big red welts all over his body. we called the public health nurse and talked to a few people and weren't getting any answers that fir our situation - then i found online that getting cold can cause hives on babies. the weather had just turned. so we started putting ds in layers and the hives went away just like that.
i hope this helps.