1 and 2
I think this mechanism is also present in humans, but it is more complex the study of this mechanism in humans mainly because defining developmental periods tend to be more complex and the in each period we will see different outcomes.
At least to my knowledge, there is no way to assess whether epigenetic modifications in humans in response to maternal behavior influence the subsequent health of the human. To make this possible we will have to control for hundred of epigenetics factors that we can’t control in our daily practice.
3-
I think the findings are consistent. I think that the exposure during a certain period sometimes is not enough, so cumulative effects add more risk, of course, this will varies according to the grade of exposure and number of events over the life course
4-
I am completed agree with that statement our phenotype is the result of complex interaction between or genotype and environment and this will make more evident disparities in health. For in two individuals with the same genetic risk for developing a disease, the environment will play the last word and it happened the same in the other way around.