University of Washington
Neuroscience for Kids: Brain Development
A good site that covers the development of the brain prior to and following birth.
University of Kentucky
Uk: Maternal Stress and Stress Hormones May Influence Fetal Brain Development
A review of recent studies that apparently show that stress in the mother can influence the development of the fetal brain.
Colorado State University
Colorado State University: Thyroid Hormones
A study suggesting that the presence of thyroid hormones in pregnancy has a dramatic effect on the development of the fetal brain.
Other
Zero to Three: Brain Development
Quick overview of baby brain development both before and after birth.