Effect of Oral Enteral Nutrition in Pierre Robin Syndrome

Inclusion Criteria: * meeting the diagnostic criteria for Pierre Robin sequence based on CT and X-ray examinations, combined with clinical manifestations and physical signs. * with spontaneous vaginal birth, aged 1 to 12 months. * with dysphagia screened by the water drinking test and further confirmed by the assessment of Dysphagia Disorders Survey (DDS), Dysphagia Severity Scale (DSS), or Schedule for Oral Motor Assessment (SOMA) * before the treatment, the tube feeding was required and feasible after evaluation. * stable vital signs. * with nasogastric tubes placed before the treatment. * sufficient human milk could be provided by the mothers of the patients (with the help of a manual suction device). Exclusion Criteria: * abnormalities in brain development or other neurological lesions. * dysphagia caused by other diseases. * other congenital malformations, such as Down syndrome, cleft lip, and palate, etc. * severe systemic disease (such as severe infection, severe hepatic and renal dysfunction). * participants who need to receive other therapy which would potentially affect the result of this study.