Hi Jac,
My little man got a really bad case of heat rash over the Christmas break and it was all over him!!!.... its like a *****ly heat rash... its red and spotty and feels a bit bumpy.
Jacob got his as we were away much longer than expected and he didnt get his baths as regulary as we do at home and we ran out of his baby bath stuff towards the end.... I found a nice bath with is baby bath stuff every morning and a light scrub with a flannel got rid of it after about 2 or 3 days... he also had a shower with Dad every night too and that was without any soaps.
His skin was back to normal (smooth as a babies bum!!) within a few days

Hope that helps
xo