Women's cradling side preference has been related to contralateral hemispheric specialization of processing emotional signals; but not of processing baby's facial expression. Therefore, 46 nulliparous female volunteers were characterized as left or non-left holders (HG) during a doll holding task. During a signal detection task they were then asked to detect the emotional baby faces in a series of baby portraits with neutral and emotional facial expressions, presented either to the left or the right visual field (VFP). ANOVA revealed a significant HG x VFP interaction on response bias data (p less than 0.05). Response bias was lowest when emotional baby faces were presented in the visual field of cradling side preference, suggesting that women's cradling side preference may have evolved to save cognitive resources during monitoring emotional baby face signals. (Contains 1 figure and 1 table.)