They found that while the crying alone is benign, the struggle of dealing with a fussy, crying baby lessens a mother's ability to cope and
their corresponding negative mood state is perceptible to the child which erodes the foundation for a healthy relationship between mother and baby.
As reported by the Watson and his colleagues» perspective (Watson et al., 1988), positive affect (PA)
corresponds to the extent to which an individual feels enthusiastic, active, and alert, while
negative affect (NA) reflects subjective distress and unpleasurable engagement that generate a broad range of aversive
mood states, including anger, disgust, guilt, and fear.