What type of Thirsties? An AIO? If so, I'd use a newborn sized insert. That's what I stuffed inside our Thirsties M AIOs. If it's a Thirsties cover you can use anything inside it from a prefold to flat or fitted. Just no microfiber against LO's skin.
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A medium sized Joey bunz premium hemp insert fits really well in the small size covers. They are overkill absorbency wise for a NB, but they will be a good long term investment. Any NB sized PF will work in the beginning.
Baby boy H is here! Born 2/1/2014
Mysterious_wife: "And for the love of all things that sparkle, remove your last name" on BOTB.
Re: Best Insert for thirsties?