I've never heard this! But someone I know - a babywearing, baby-led-weaning, exclusively breastfeeding, cloth-nappying saint of an acquaintance who I've posted about previously - is going on about it on Facebook (she saw someone doing it and was going to approach them to tell them it was wrong. Like SO wrong. Ugh).
I can't believe I've never heard this before! We wore E facing out all the time (for very short periods, to be fair).
Is my acquaintance being a douche-waffle again or is she right on this one??! Is it actually terribly dangerous??