There is a study[1] that backup this claim. The two main key findings are: Women from disadvantaged backgrounds and lower early achievement levels experience

There is a study[1] that backup this claim. The two main key findings are: Women from disadvantaged backgrounds and lower early achievement levels experience a more significant fertility-decreasing effect from college education. And the effects of college on fertility attenuate as the likelihood of college attendance and completion increases. But I have to say, that it rely on data from 1979, that is nearly 50 years old. However, there are many studies that back up the claim that 'higher education levels are associated with lower birth rates.' The key findings of the linked study here close the gap between the poor and the educated in my opinion. Personally, I prefer to follow this theory because life style means that no partner is needed to have children, and that having children is not a problem even at an age over 40. Of course, both are only possible if you are really rich and they are the other extreme of the spectrum. But in my opinion, this is what life style means. [1] https://pmc.ncbi.nlm.nih.gov/articles/PMC3449224/ https://pmc.ncbi.nlm.nih.gov/articles/PMC3449224/