The predominant issue (at least in the US) is that parents have fewer kids. The number of women who have had at least one kid hasn't dropped that much in 45 yea

The predominant issue (at least in the US) is that parents have fewer kids. The number of women who have had at least one kid hasn't dropped that much in 45 years.[1] In 1976, 90% of women between 40-44 have ever given birth. In 2016, it's 86% (up since a low of 80% in 2006). [1]https://www.pewresearch.org/social-trends/2018/01/18/theyre-waiting-longer-but-u-s-women-today-more-likely-to-have-children-than-a-decade-ago/ https://www.pewresearch.org/social-trends/2018/01/18/theyre-...