K.M.
Honestly, not sure about this one ... but here is what I would do were I you ... document how often and see if you can get a temp on his legs with one of those forehead strips (take temp when it's normal for comparison) ... talk to the pedi about what is going on and what patterns you have/have not found. Maybe one of the moms on here will have more for you but this is what I tend to do when something odd is going on but I can not find a quick/easy answer. Document any other odd symptoms along with diet/waste patterns.