Serum BDNF declines from 1st through 3rd trimesters and increases postpartum.
Black women exhibit higher serum BDNF than Whites during pregnancy and postpartum.
Lower serum BDNF at 2nd and 3rd trimester predicted greater depressive symptoms in 3rd trimester.
Women delivering low vs healthy weight infants had lower serum BDNF in the 3rd trimester.