The present study assessed 322 parents of 173 children aged between 12 and 20 months (74 children born preterm) with the Parent Development Interview (PDI) to capture parents' Reflective Functioning (RF). RF scores were obtained, and topics were disclosed, for which modeling with Latent Dirichlet Allocation (LDA) was applied. The study addressed (a) whether RF scores differed between fathers of children born preterm and at term, and diverged from the mothers' RF and, (b) whether topics on fathers' minds differed regarding parenting preterm or at-term children, and diverged from topics on parenting raised by mothers. Results indicated that parents of at-term children revealed similar RF scores, though fathers of children born preterm scored lower than mothers of children born preterm. Whereas fathers' RF scores were associated with topics about the paternal role, interests and activities, mothers' RF was related to concerns about how to meet the child's needs.