It is also due to a vicious cycle of fewer children who then have fewer children, said Takuya Hoshino, senior economist at Dai-ichi Life Research Institute. For example, Massachusetts has the most expensive childcare but has the fourth lowest fertility rate out of the states. Instead, Dr Levine thinks the falling birth rate is likely due to 'changing preferences, life goals and aspirations' among women and their partners. A falling birth rate is detrimental to a country for several reasons. Dr Fischer agreed that the reasons for America's falling birth rate are sociological.