Abstract: Objective To design a biomimetic ectopic development position assistance management package and evaluate its application. Methods The biomimetic ectopic development position assistance management package consists of three parts：2-in-1 warm and anti-jumping blanket,wrapped bottom cushion,and supportive and fixed belt. Using the method of quasi-experimental study,94 preterm infants admitted to a Grade 3 A children‘s hospital in Hangzhou from July 2022 to May 2023 were selected as the study objects. Forty-seven preterm infants admitted from July to November 2022 were included in the control group,and 47 preterm infants admitted from January to May 2023 were included in the experimental group. The experimental group used the biomimetic ectopic development position assistance management package for positional support;the control group used the traditional "bird‘s nest" for positional care. The length of 24-hour physiological flexion and poor posture in different positions,the effectiveness and comfort of position maintenance,the number of startle reflexes,the length of sleep,and the growth and development of preterm infants at 4 weeks after birth were compared between the two groups. Results In the experimental group,the length of physiological flexion was significantly greater than that of the control group in the supine position and the left and right lateral positions,the length of poor posture was significantly less than that of the control group,and the effectiveness of position maintenance and comfort were significantly higher than that of the control group,and the differences were statistically significant（P<0.05）. The number of 24-h startle reflexes in the experimental group was significantly less than that of the control group（P<0.05）. The length of 24h sleep,and the body weight gain of the experimental group in the second to the fourth week were significantly higher than those of the control group（P<0.05）. Conclusion The biomimetic ectopic development position assistance management package helps preterm infants maintain physiologic flexion,improve comfort,which can effectively promote preterm growth and development.

Key words: Preterm Infant, Postural Care, Development Support Care, Intensive Care, Critical Care Nursing