Hi there,
As a Trageschule trained sling consultant, we advise against breast feeding in a wrap, especially for newborns. There are many other practical reasons to using a sling. As a breastfeeding mum, I take a sling and a mamascarf when I am out and about:
http://www.precious-bundle.co.uk/index.php/default/baby-nursing-feeding.html
Regards,
Wendy