This was mentioned tangentially in the Dreft thread, but wanted to point out to moms who don't know that sleepwear for kids starting at 9 mo often has chemical flame retardants in the thread or applied afterwards. I guess some people find this comforting. I personally try to avoid it and only use yellow-tagged jammies. But in any case, something to be aware of as another parenting choice we all get to make.
https://healthychild.org/avoid-cold-weather-nightmares-pick-pjs-free-of-flame-retardants/
Re: flame retardants on sleepwear
Are your clothes fire-retardant?
No. Industry standards dictate that if a piece of kids' or infant clothing is going to be fire-retardant it has to be coated with a chemical. Hatley tries to keep its clothes as natural as possible using mostly natural fibers. In order to maintain compliance with industry standards our clothes are snug fitting instead.
That said, I try and steer clear of flame retardant PJs. Our favorite PJs are Old Navy, GAP & Hanna Andersson -- the snug fitting ones (one piece zip ups for under a year and the two piece sets for toddler). I've found a lot of snug fitting PJs are not treated with FR (example: the looser PJs at Old Navy are treated with FR, but the snug fitting ones are not).
It's not about a blazing house fire (where no fire retardant in the world will save you), it's about sparks or accidentally coming too close to an open flame.
I'm personally going to try to avoid it since extra junk coming into persistent contact with my LO's skin is really not what I'm going for.