I have about 6 moms where the timer has stopped, and another four with the timer running. I've tried switching speeds, I've tried to grant youth (had one that stopped one at 51 minutes that had been counting down but she was in her 70's and I didn't want her to die). Ine thing I have noticed, and maybe it is just in this one game, all the ones with broken timers are Elders some even having four skills at Master level. The non-elders don't seem to have a problem carrying to term.