Indeed I noticed a strange phenomenon in Russia over all the birth rates ARE growing  in  vs  in   in  vs  in  at the end of each of those years they went down slightly    in  for example Ill have to research this more to really see why this is But if I had to say now Id say it is because of the New Year and Orthodox Christmas as well as Muslim Kurban Bairam celebrations November December January is when everyone is celebrating and partying Not a lot of people are conceiving during this time