Objectives: The aim of this study is to examine comorbidities in pediatric patients with newly diagnosed type 1 diabetes mellitus. The specific objectives of the research are to investigate the clinical characteristics of children with type 1 DM concerning age, gender, BMI, family history, comorbidities, immunological parameters, and psychological profiles of the participants. Study Design: The study was structured as a historical cohort study. Patients and Methods: The research was conducted on a pediatric population of patients with newly diagnosed type 1 DM confirmed over a seven-year period (from 2017 to 2023) – 112 patients. Data were collected from the medical records of patients with type 1 DM, including age, gender, perinatal factors, family history, clinical features, comorbidities, previous illnesses, immunological features, and psychological profiles of the participants. Results: The most common comorbidity was AI thyroiditis in 29.5% of patients, followed by vitamin D deficiency (15.2%) and celiac disease (11.6%). The clinical characteristics of children showed no differences regarding gender, with higher weight loss observed in older children (median 11 years vs. 8 years) and higher BMI. Family history burdened with autoimmune comorbidities, mostly in mothers (26.8%). Immunological features included the presence of GAD and IA-2 antibodies, while psychological profiling revealed anxiety (25.9 %) and negative self-perception (17.9 %). Conclusion: Type 1 DM is a polygenic autoimmune disease that often coexists with other autoimmune diseases due to the complex influences of genetic and environmental factors.