Yesterday, my son was fine. No rash, good mood and it was actually a bit cool. Today when he woke up he had a rash on his chest, legs and arms. He's had one before but it was only under his arms a little. When should it go away? I just checked him now and it's still as bad as this morning.
When he cools off. try a cool bath.
On Thursday, my daughter developed a rash EVERYWHERE!! I thought maybe it was heat rash, but she STILL has it. :( I think hers might be an allergic reaction to something...? I hope his goes away asap!