One Week Postpartum with Rash

M • wife to my ranchin’ cowboy. momma to cash and stetson and due with #3 in february ❤️
Hi everyone!
This last week my son (21 months) started to get a rash all over his body. They are little red dots and started from his cheeks all the way down to his legs. It didn't bother him and it wasn't itchy, it has now almost gone away (probably been a few days total that he had it). 
But then I started to get it and I'm one week and three days postpartum. I am breastfeeding and my rash started on my chest, grew to my belly, some on my arms and this morning it spread to my cheeks. Same thing, they are little red dots. I don't itch it and it gets uncomfortable when I'm hot or sweaty. Is this dangerous with breastfeeding my newborn? Does this sound bad? We have not made any changes recently (like detergent, food, soap, etc.) so I can't figure out what is causing it. 
Sorry for the low quality photo and my breast pads peeking out. 😂