Polycystic Ovarian Syndrome

[Professor Yaffle]

I have been having a look, and haven't been able to find any proper research on it (yet). All I have found is that it is asserted (without reference or attribution) on a few information sites about PCOS

Despite the problems that can present themselves to PCOS sufferers looking to get pregnant, a successful pregnancy is entirely possible and has been experienced by numerous women with PCOS. In fact, for many women, getting pregnant the second time around is much easier. Furthermore, it is not unusual for PCOS sufferers to notice that their menstrual cycles begin to regulate themselves after a pregnancy.

http://www.womens-health.co.uk/pcos5.asp

Although getting pregnant can be problematic for women with PCOS, many have found it easier to get pregnant the second time around. Additionally, some women have found that their menstrual cycles regulate themselves after a pregnancy.

http://www.pregnancy-info.net/infertility_PCOS.html

ETA - I am starting to suspect it might be an anecdotal, experience related thing, not based on research. I found this study which showed that menstrual regularity improved with age, and that previous pregnancy had no influence on this effect.
http://humrep.oxfordjournals.org/cgi/content/abstract/15/1/24

...patients showed a highly significant linear trend (P < 0.001) for a shorter menstrual cycle length with increasing age. Logistic regression analysis for body mass index, weight loss, hirsutism, previous treatment with clomiphene citrate or gonadotrophins, previous pregnancy, ethnic origin and smoking showed no influence on the effect of age on the regularity of the menstrual cycle.

 

[Dr. Imago]

Maybe Dr. Imago has a reference.

Reference? Hey, there is still some debate as to whether or not PCOS is actually a discrete syndrome and not actually a manifestation of some other endocrinologic disorder.

~Dr. Imago