Say what you will. In the end, humans want what is best for their offspring.
NGL, that's a truely ignorant opinion. From first hand experience, a flat chested women are every bit as capable of producing milk as a lady with double Ds.
Sure my wife could easily feed an additional child with her DDs, but her flat chested friend always produced more then enough to feed her own..
As an aside, the flat chest friend never experienced her breasts filling so full they caused her pain, nor leaking so much that she would soak thrue her bra, additional pads, and whatever shirts she happened to be wearing at the time.
So no, large breasts are not the genetic advantage you seem to think it is.