Are mesh slings safe for newborns?

Mesh slings get praise for supporting floppy newborns but draw consistent mold complaints. r/BabyBumpsCanada and r/twoxindiamums threads on the Skip Hop Moby specifically flag mesh mold if it isn't dried in the sun. r/beyondthebump also raised a safety concern about the Fisher-Price 4-in-1 cutting infant toes. The mesh itself isn't inherently unsafe, but it requires more drying diligence than a plastic-only tub.