This study aims to evaluate the influence of fathers' negative feelings, parenting stress and post-traumatic symptomatology experienced after the premature birth of their infant on mother-child interaction and on infant's development in the perinatal period. Forty-five fathers and 45 mothers of preterm infants (GA = 30.25 ± 2.95; birth weight = 1288.02 ± 488.76) filled out:Impact of Event Scale Revised, Profile of Mood States and Parenting Stress Index Short Form. At 3 months of infants' corrected age, mother-child interactions were assessed by Global Rating Scales (GRS) and the development of the preterms was tested by Bayley Scales of Infant Development. Higher scores in paternal feelings, stress and post-traumatic symptomatology predicted lower scores in Global Rating Scales dimensions and in the Bayley Scales of Infant Development scales. Feelings and stress experienced by fathers of preterms should be considered risk factors for the building of mother-child interaction and for the early language development of preterms.