Nasogastric Tube Feeding were used for feeding to provide nutritional support. Each feeding was administered by a nurse using the infant's mother's breast milk through the tube. The amount of each feeding varied from 20 to 100 ml depending on the age of the infant, with feedings given every 2 to 3 hours, approximately 10 times per day. The duration of each feeding procedure ranged from 10 to 20 minutes. The total daily intake ranged from 200 to 1000 ml. Each tube was kept indwelling for 5 to 7 days. When the tube needed to be replaced, it was removed after the last feeding of a day and a new tube was to be inserted through the other nostril on the following morning to continue the nutritional support.

Both groups were given comprehensive rehabilitation therapy. The main intervention measures included: 1) non-invasive ventilator treatment, generally at least once every night and typically not exceeding continuous daily usage.; 2) attention to feeding and sleeping positions, with a recommended sleeping position of lateral recumbent and the head of the bed raised by 20-30°; 3) swallowing function training, such as tongue muscle stretching training, assisted anterior jaw protrusion training, lemon ice stimulation to the soft palate, pharyngeal wall, etc., generally 5 days per week, twice per day, 5-20 minutes each time; 4) pulmonary ultrashort wave therapy, generally at least 2-3 times a week, and not more than once a day; 5) physical therapy, such as intensive training for gross motor functions including lifting the head, turning over, sitting, crawling, standing, etc., generally 3-5 days per week, 1-2 times per day, 5-20 min each time.

Weight and height will be combined to report Body mass index in kg/m^2

Serum albumin was recorded via blood routine test.(Alb, g/L)

Hemoglobin was recorded via blood routine test.(Hb, mg/L)

The occurrence of pneumonia in patients was assessed before and after treatment. Specifically, first of all, the symptom assessment and physical examination were conducted to all patients, during which, the doctor would inquire symptoms related to pneumonia, such as cough, sputum production, difficulty breathing, chest pain, etc. and observe the patient's respiratory condition, including respiratory rate, breath sounds, and any abnormal signs in the chest. If there was probability for potential pneumonia, patients were requested to undergo lung CT for further diagnosis

The activities of daily living was assessed utilizing the Modified Barthel Index (MBI). Modified Barthel Index includes the following 10 subscales. For each subscale, choices encoded with the score 10, 8, 5, 2, 0 are set with the decreasing level of self-dependence, while the final total is positively correlated with Activities of daily living. Cronbach's α of questionnaire adopted is 0.916.

The Quality of Life was assessed utilizing the World Health Organization Quality of Life Assessment Instrument Brief Version (WHOQOL-BREF). WHOQOL-BREF covers various aspects such as mobility, pain, emotions, personal relationships, living conditions, and access to health services, to evaluate Quality of Life. Each item is rated on a Likert scale, and the scores are transformed into a standardized score ranging from 0 to 100, with higher scores indicating better Quality of Life.