I'm on day 80 of just spiro and estradiol, and I have a very significant amount of fat on my chest
However, no breast buds as of yet, although, feeling a sort of void behind the nipple, and strangely I lactated once (to my knowledge) very early on, like day 20-25.
A feeling of weight is very apparent, and has been for some time now, but I did posess some fairly large pectoral muscles that have defiantly been reduced, possibly contributing to the feeling/look of growth of my breasticles. If I put on a slightly small(bust) B padded bra I fill the padded cup almost perfectly, and with growth staying on the same track, will fill the cup entirely in about 2-3 weeks = ) , but my mother, 1 sister, and niece, closest genetic relatives, have gigantic breasts so I think I will come out a head...and before you curse me for good genetics, even the females in my family have dark body(arm and leg) hair.
With hormones you win some, you lose some, apparently...I'm 22, so I assume the younger you start the closer you get to what you would have had, the key factor to me "rushing" HRT(Rx by an endo w/ a letter).