Private maternity services could be needed by mothers who are concerned about the stress levels of their child.
According to recent research, the hormones in a depressed woman's body can play a role in their unborn child's brain development.
Conducted by the University of Michigan, the research found that a higher level of depression in mothers during pregnancy is associated with higher levels of stress hormones in their children at birth.
Other neurological and behavioural difficulties were also identified in the babies.
Lead author Sheila Marcus commented: "We're just beginning to look at these differences as part of a whole collection of data points that could be risk markers.
"These in turn would identify women who need attention during pregnancy or mother/infant pairs who might benefit from postpartum programs known to support healthy infant development through mom/baby relationships."
The researchers suggested that mothers experiencing symptoms of depression during pregnancy might want to talk to a therapist.