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[–]MarkTwainiac 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (0 children)

From what I've read, the breasts that males who've been through the male puberty of adolescence grow later in life when taking estradiol do not develop the lobules, ducts and milk glands that in female people mature and develop during female puberty. In male puberty, the breast tissue does not get the same signals as breast tissue gets in female puberty, and my understanding is that male sex hormones in males during puberty causes permanent atrophy of the structures in the breasts related to lactation.

It's not clear what happens to males whose development has been blocked with GnRH agonists aka "puberty blockers" at an early Tanner stage like Jazz Jennings.