Right after WW2 could be an opportune moment for Russia to have a baby boom with the right POD, the Soviet birth rate was something like half that of the US and other victorious allies, if you could somehow avert that then it would result in a massive population increase down the line
There were several reason for this:
- The USSR suffered between 8 and 20 times as many military casualties per capita as the western allies, which led to certain age cohorts losing up to 50% of unmarried men. For many women there simply were no men to marry and start a family with.
- Unlike in the west, where most women after the war had to vacate their jobs for returning war veterans and had no choice but to marry and become house wifes and frequently endure marriage to mentally scarred, often abusive husbands, a majority of the women in the USSR remained employed and had a choice.
- Large portions of the country had been devestated by the war and more often than not it took many years before the cities became habitable again, not exactly a good environment to start a family in.