I am very sorry I didn't phrase my OP better.
I really did me only what I said - we need to question what unconscious biases researches will have.
I would be sceptical of a study of (say) aboriginal AUS populations that was carried out entirely by white immigrants to Australia. As I think we all would? And of course, the earliest surveys will have been by white immigrants. And we learn to correct assumptions. But it is not possible to correct every single unconscious assumption, because try as we may, we won't recognize all of them. I know I don't.
My aunt told me about an interesting example a year or so ago. In my area of the country, people did a survey of working-class children to see how well-nourished they were. The survey asked what they had for dinner (the main meal). The children said, not much. The surveyors tried to question their assumptions and though, hmm, maybe over here, lunch is the main meal. So they asked that, and again the children said, we don't have much for lunch.
It didn't occur to them that round here, the main meal of the day is tea.
So they wrote up their report saying that these children were severely malnourished and it was going to result in all sorts of health issues down the line.
It's easy for us to see the flaws, but I think we can see why the researchers didn't, too. Ideally, you want researchers from as broad a spectrum of backgrounds as possible. So, I do feel it's valid to suggest we question research when we know a certain group isn't represented.
Hopefully, this may also motivated women who're mothers to see their perspective is something researchers are crying out for.