I just checked my little lamb fitted nappies (bought new about 4 months ago) and the label on the says to wash at 60c
I'm trying to think if it says 40 or 60 on the label of mine which are 2 years old. Either way, it took me a while to find washing info on the website. This is from the FAQ section under the question "how long will my nappies last?"
Quote from Little Lamb website
A few tips on making your nappies last longer
*Always close over the Velcro tabs prior to laundering as otherwise the hooks will snag on any lint passing by, reducing their effectiveness.
*Wash reusable nappies at mainly 30˚c and a cool rinse. A hot wash every now and then is OK but regular hot washing will affect the life of the Velcro and elastic.
*Do not use any kind of fabric softener as this will coat the fibres reducing absorbency.
*Do not use any kind of sanitizer. It was OK for cotton nappy squares in grandma’s day but on a modern shaped nappy it’ll affect the Velcro and elastic.
*Try and avoid a drier when possible. The fluff you clean from the drier filter has to come from somewhere!