I carry my babies until they hit about 16lbs in a Moby-like wrap. More like a simple baby sling. I make my own slings, using about 3 yards of fabric. Mine look like these:
https://www.amazon.com/Beco-Baby-Car.../dp/B0182YMUMG . I buy these sling rings for it :
https://www.amazon.com/Roo-Threads-P...7S33A3DT2&th=1 . I use quilting cotton. More breathable than knit I think.