I'm not sure I understand what you're asking for but if you mean visualising brain structures undergoing development in utero you should take a look at work done by Cancedda Lab, like in this paper: http://www.nature.com/nprot/journal/v11/n3/full/nprot.2016.014.html
If their is a blood test done on a mother that could suggest theres a problem in the development of the brain before an ultrasound could see the defect, something like that.