Understanding Early Development of Infants and Toddlers

Inclusion Criteria: * Infants and young children aged from 16 days to 42 months at the time of assessment. * Participation of a parent or legal guardian able to provide informed consent. * Child's ability to participate in a standardized developmental assessment appropriate for age and developmental level. * Availability of basic medical and perinatal information provided by parents or caregivers. * Assignment to one of the predefined study cohorts based on medical history and developmental status: children from the general population (control group), children with developmental delay, children with confirmed genetic conditions, children born preterm between 33 and 37 weeks of gestation, children born before 33 weeks of gestation, children with a diagnosis of cerebral palsy. Exclusion Criteria: * Severe acute medical condition at the time of assessment preventing participation in the psychological evaluation. * Uncorrected severe sensory impairments (e.g., profound visual or hearing impairment) that preclude valid administration or interpretation of the developmental assessment. * Medical instability or conditions requiring immediate intensive medical care. * Lack of informed consent from a parent or legal guardian. * Inability of the parent or caregiver to provide reliable information required for questionnaire-based assessment.