Boobs creating colostrum at 4 months pregnant?

hi im currently 4 months pregnant with my second child.. i thought i would have remembered every little detail from my first pregnancy but i seemed to have forgot... like when do my boobs start to get bigger? as they've started to produce colostrum?.. im not looking forward to them being so uncomfortable and big!!!Boobs creating colostrum at 4 months pregnant?
i'm 34weeks with my first child and my colostrum starting coming in at 4 months as well... doesnt leak all the time, but on most daysBoobs creating colostrum at 4 months pregnant?
I'm 28 weeks and mine started when i was about 22 weeks. Weren't major but it seems to be getting heavier lately. Thing is my boobs aren't sore or full like they were when i was about 12 weeks pregnant so i can't really complain at the moment!
I was quite surprised when I noticed colostrum secreting from my boobs at 24 weeks. This is my first pregnancy so I can't really compare.

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