I have a "I should know this" question about baby bedding...

[3 ladybugs]

I am researching for my next child and I realized that I didn't know something and I hope someone is smarter then me here.

Are all children's sheets fire retardant? What about the "organic" ones? Are they treated just like children's sleepers?

I make all of my son's pj's so he doesn't have the chemicals on him. He has adult sheets on his bed. I am just trying to protect my children from the chemicals.