Clinical Research Directory

Inclusion Criteria: * Preterm babies (\<34 weeks of gestation) born between March 2020 and December 2021 for case group). * Preterm babies (\<34 weeks of gestation) born between January 2023 to December 2024 (control group). * Babies who were admitted to the NICU of the Hospital de Sant Pau. * Babies who were followed up in External Consultations of the same hospital at least until their first year of age. Exclusion Criteria: * Preterm infants ≥34 weeks or preterm born outside the periods described in the inclusion criteria. * Concurrent diagnosis of genetic pathology or major malformations. * Families who discontinued follow-up or did not attend scheduled appointments.