I know they are. I know mothers have used them in all cultures for generations without issue. I've bought one as newborn DD won't settle unless she's on me and now I'm doubting myself.
Have you used one? How did it go? Do you feel like you always need a hand on the baby so you're never truly hands free? Mine arrives tomorrow and I'm hoping it'll be a lifesaver but I'm also terrified because I'm an anxious mess about everything right now.