funny you should mention , i got mastitis after i carried around dd in a tomy pouch, it was also major stress on my back too , so i would stay away from the pocuh type like baby bjorns ..

you could try an ergo , he may still need the infant insert though , but from 2 fellow (me and my dh) bad back suffers we absolutley praise the ergo as is so not hard on our backs at the end of the day ..

also you can try a mei tei ...