Dr. Barry Sears Dr. Sears Comments:

The most likely reason is the fetal depletion of the omega-3 fatty acid stores of the mother.  In the last trimester of pregnancy the fetal brain is producing 250,000 new brain cells per minute, and this requires a lot of omega-3 fatty acids that can only come from the mother.  If the mother’s levels of omega-3 fatty acids drop below a critical threshold, neurological disorders, such as depression, can be easily manifested.