Emotional trauma in the mother world definitely raise the levels of certain chemicals that are present in everyone's body, since what's in the mothers blood is shared with unborn baby, yes the baby would experience distressing conditions.

However unless the mother is under constant, long term stress it would be unlikely to cause long term effects in the baby. But something like PTSD could be caused in the baby if the stress is indeed severe and long term.

I can't say for sure if this would cause long term effects for the baby after birth.