https://baike.baidu.com/item/%E7%8B%BC%E5%AD%A9/100305
就是出身论了
比较有名的罗马尼亚孤儿研究：An early life full of neglect, deprivation and adversity leads to people growing up with smaller brains, a study suggests. The researchers at King's College London were following adopted children who spent time in "hellhole" Romanian orphanages. They grew up with brains 8.6% smaller than other adoptees.Jan 7, 2020
读过一篇英文文章，说如果孩子小时候没有大人去爱他、她， 和大人没有互动，那么到三岁时候智力其实就已经低下了。输在起跑线上。
这篇文章的主题是说，不论种族，如果孩子出身在单亲多子女家庭，往往打小就没跟家长有足够的互动。 到3岁时候哪怕有DayCare也挽救不了。所以国家有免费甚至补贴的3岁开始的Daycare也不行。