Effect of massage on improving preterm feeding intolerance: a randomized contolled trial

INTERVENTION: experimental group:massage;control group:Nil; CONDITION: preterm feeding intolerance PRIMARY OUTCOME: the time from the beginning of oral feeding to the realization of whole intestinal feeding; INCLUSION CRITERIA: 1. Admitted between February 2021 and February 2022; 2. 28 weeks <= gestational age <= 34 weeks, 1000g <= birth weight <= 2000g, admitted to the Neonatal Treatment Center of the Affiliated Children's Hospital of Chongqing Medical University within 24h after birth; 3. Stable vital signs; 4. Meet the FI diagnostic criteria; 5. The child's guardian is willing to participate in this study.