Its *considered* harmful to children in this case as it exposes a part of the female anatomy considered again by the society to be shameful and/or only to be exposed in the act of sex.
So wait... you're saying that "society" believes that when a woman is breastfeeding her child, that she's really having sex with it?
As a result, viewing this part of the female anatomy at a young age is assumed by this society to lead to children having and accepting sex more freely.
So you're claiming that "society" thinks that unless breastfed children are blindfolded first, that they'll start having sex immediately? (Well, I guess that's a given if your first claim is taken at first value.)
All I have to say is that you *really* need to see a mental health professional. Your statements are neither rational nor normal.