One of my dwarves who entered the Bookkeeping Stat Training Program has seven children, one came with her(and her husband, ) to the fort, the rest were born here. When the oldest grew up, she was almost immediately elected mayor thanks to the previous mayor dying a bloody death fighting some goblins shortly after she grew into an adult dwarf. Now the former bookkeeper has recently been elected mayor(perhaps she has so many children with so many connections now that she has half the fort guaranteed to vote for her?), but I doubt that'll stop her from pumping out a baby a year.
At least she's just a mayor/crap hauler and her husband's a legendary weaver(thanks to an artifact loincloth), so there shouldn't be any tantrum spirals unless I start killing family members on purpose...then again, one of her babies died when it fell down a channel she was digging(the joys of discovering that the convenient underground water source I had was actually an aquifer from a biome that only covered a small part of of my fort, and that digging beneath it was actually a Very Bad Idea...and that claystone can contain aquifers, despite the wiki not listing it as such) and the parents were still ecstatic, so maybe there are so many kids now that they just don't care. Or perhaps they were happy at discovering the only dwarven method of birth control?