I couldn't find much info beyond a lot of sites that tell how to use a wrap in the hip carry position. This site actually recommends carrying your baby on your hip (amongst other carries).
I wonder if he's thinking of the advice against mainstream baby carriers, like the Bjorn, that force the baby's hips into an unnatural position?
I wonder if he's thinking of the advice against mainstream baby carriers, like the Bjorn, that force the baby's hips into an unnatural position?