Probiotics and Oxytocin Nasal Spray on Social Behaviors of Autism Spectrum Disorder (ASD) Children

This study description is in accordance with the Consolidated Standards of Reporting Trials (CONSORT) guidelines that are published for the evaluation of randomized controlled trials. This clinical trial is a randomized, double-blind placebo controlled study. Subjects will be randomized to 2 groups: Phase 1: a. oral placebo, and b. oral probiotics; Phase 2: a. intranasal Oxytocin(OXT) + oral placebo, and b. intranasal OXT + oral probiotics The treatment will proceed for a total of 28 weeks. In the first phase (16 weeks), all the patients will be randomly and proportionally divided into two groups: Group A (30 subjects) receives oral probiotics while Group B (30 subjects) receives an oral placebo. In the second phase, subjects in Group A and Group B will continue their respective oral probiotics or placebo administration as in Phase 1. In addition, both groups will be simultaneously administered with intranasal OXT spray. Testing will be performed 3 times total (before, during, and after treatment). The tests include behavioral surveys, cognitive tests, clinical autonomic tests, and blood tests for oxytocin levels. Investigators plan to select up to 10 subjects from each group to conduct a series of MRI studies at week 0, week 16 and week 28.