When my son starts drinking milk, he sweats all over his head and drops like drops on his head. Normal head is very hot. When he sweat, he feel cold, and when he wake up again, his head is very hot. It's like this from when the fever came after a month and a half of vaccination. But it changed after a few days. Now, after two and a half months of vaccination, this is after when the fever came. Has anyone had this happen? Does it require treatment?? What should be noted??