*bashes head against wall* So your sister's husband fed their baby his/her breast milk? Or...you kow, maybe he didn't do that and used things which weren't available 20000/30000/40000/50000/+ years ago?
I recommend to stop the wall bashing and try to pay more attention to the posts you respond to, like the part where i write, exactly right after the quote you made, "
Strictly speaking the mother is only needed to breastfeed the baby, beyond that it can be taken care by the father". My sister breastfeed her baby and her husband took care of the baby while she was at work.
Anyway, i'm sure you could understand this if you bothered to pay attention, but the fact you didn't confirms to me that this discussion isn't really worth anyone's time.