I agree with Phemox here, no matter how much evidence we show, no matter what sources we cite, etc.. Irish is convinced he is right and the entire scientific community is wrong.
However, that doesnt mean we should stop trying.
To get back to topic, lets take a look at the evolutiom of mammals from early reptiles.
The main branch-off from the reptile line occured around 280-210 m.y.a. with the emergence of the synapsids. The cynodonts are the group of synsapsids that are likely to be closest to modern mammals. So as you can see, this divergence occured a vastly long time ago, before the dinosaurs even appeared.
Synapsidds and cynodont didnt have mammary glands however. Before mammary glands could devlop, skin glands needed to develop. Reptile skin doesnt have such glands, at least not like mammal skin glands. Mammary glands are just specialzed skin glands, that likely devloped from sweat glands at the hair follicle area.
To see what primitive mammary glands may have looked like one can look at the monotremes, like platypus.
"The platypus female doesn't have nipples, but there is a region whre milk ducts come together and secrete milk onto hairs from which the young then lick or suck the milk. Nipples probably first emerged with Marsupials."
http://alas.matf.bg.ac.yu/~neman/mammal%20evolution/index.htmlSo, you can see how evolution proceeds by modifying existing features to serve new purposes. breasts didnt just appear one day like magic.
