In one study:

"...results show that higher levels of maternal posttraumatic stress symptoms are associated with a higher level of psychosocial problems of infants, but not with delays in their mental or psychomotor development. The results also show that higher levels of maternal posttraumatic stress symptoms are associated with higher levels of insensitive, unstructuring, or hostile, but not intrusive, parent-child interactions. Infants show lower levels of responsiveness and involvement to their traumatized mothers. Parent-child interaction did not function as a mediator between maternal trauma symptoms and infants' psychosocial functioning. Results are discussed in relation to the dyad's regulation of emotions. Results implicate a need to reestablish attunement between traumatized mothers and their nontraumatized children."

Healthy and calm mamas, healthy and calm babies.

Reference
Title: War trauma lingers on: associations between maternal posttraumatic stress disorder, parent-child interaction, and child development
Author: Van Ee, Elisa; Kleber, Rolf J; Mooren, Geertruida Theodora Maria
Affiliation: Foundation Center '45, Diemen, The Netherlands ; Utrecht University, Utrecht, The Netherlands
Source: Infant Mental Health Journal, Published online 3 May 2012