Let me first say that I have weird hormone levels before I started HRT. My prolactin was 47 (no clue about the unit), but the lab that measured my prolactin had a scale and for males it was supposed to be between 5-12. And I know an almost full term female is like 50 on their scale, so 47 is high. My doctor acted like it was no big deal. She said that if it was a tumor my prolactin levels would be in the hundreds. Additionaly, my progestorone was also quite high for a male.
Anyway, I had been on HRT for 4 months and decided to have an actual breast exam. Besides finding out I had Tanner stage III breast development, I also found out I lactate rather easily! The doctor was doing her thing and she said, . . . "they look good, and theres a lot of fluid coming form the right nipple here, it looks like you are lactating." BTW, I was giggling the whole time, it hurt/tickled so much!
Um, so yes, with HRT and a few months, I experienced lactation.