Here is a deep neuroimaging study of 52 fetal humans and their brain maturation states.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8583264/

I recognize the Catch 22 that the diagnosis is not possible until several years after birth. But a prospective study of this sort is “in scope” at UCSD. They already have big MRI studies of kids with hundred or even thousands of scans.