BackgroundDevelopmental delay in infancy includes cognitive-language delay, fine motor delay, gross motor delay, and social-self help delay. Delay in one intellectual domain frequently effects the other areas of development; therefore, determining risk factors are essential. In this study, we evaluated the relationship between maternal psychiatric symptoms and developmental delay types of infants who have not a known risk factor and are expected to show healthy development but have some behavioral and developmental problems. MethodsThe sample consisted of 79 infant–mother (26 girls, 53 boys) dyads who had been admitted to the Department of Child and Adolescent Psychiatry at Gulhane Research and Training Hospital over a one year period. Brief Infant-Toddler Social and Emotional Assessment Scale, Brief Symptom Inventory and Ankara Developmental Screening Inventory were used. ResultsThe most frequent developmental delay types were fine motor and social -self-help delay in this sample. For all developmentally delayed infants, maternal interpersonal sensitivity, and depression scores were higher than healthy developed ones. Logistic regression analyses revealed the risk factors: Higher maternal paranoid ideation increases the language-cognitive delay; maternal hostility and anxiety increase the gross motor delay; maternal psychoticism increases the social and self-help delay, and maternal depression increases the total development delay of infants. ConclusionMaternal depression, anxiety, psychoticism, and paranoid ideation are important risk factors for infants' developmental delay types and should be addressed while evaluating infant-mother dyads in clinical practice.