Newer research has linked changes in the expression of genes that regulate stress responses, to the way mothers care for their children. These epigenetic studies also reveal how environmental stress can have a damaging effect on maternal care causing a vicious cycle that transcends generations. /google for epigenic + …. !
So not difficult to understand how and why! And our future is really put at high risks!
We tend to think of our genetic information as being encoded in DNA – in our genes. Brona McVittie from Epigenome NoE, UK, describes why this is only part of the story.