this question has an obvious answer.
If you had simply googled the seed I gave you, and looked at the wiki, you would know.
That neither nipple or breast size has any real bearing on whether a woman is able to breast feed. At birth the breasts are ready, if the demand is there, it produces. If not, it shuts down. Since human men do not give birth
[1]. There is no 'trigger' for men to start producing, so therefore there's no need for nipples.
It is true that there are anomalys, both in men and women, but it is far from the norm.
So far outside the norm that if a woman lactates, it is understandable to assume she's been pregnant.
So far outside the norm that if a woman is/was pregnant, it is understandable to assume she's not a virgin.
Did it ever get to the point of Joseph holding the stone, then stating he's going to marry her anyways
[2]? Or was it before the 'lifting of the skirt' err "examination"?