Tummy time is defined as awake prone positioning with unrestricted movement of limbs,which is encouraged and supervised by adults.As one of the most important physical activities during early stages of life,tummy time plays a critical role in promoting gross motor and cognitive development,preventing plagiocephaly and decreasing overweight and obesity.Recently,the World Health Organization and many countries worldwide issued guidelines on tummy time for infants;however,there is no tummy time guideline in China.To fill in this gap,the Capital Institute of Pediatrics,together with experts from sports science,pediatrics and child health care,has jointly developed the Infancy Tummy Time Guideline.As the first tummy time guideline for infants under one year old in China,it aims to provide professional recommendations for both child care professionals and parents.The guideline raises recommendations from four aspects,including principles for tummy time,duration and frequency,types of tummy time activities,and monitoring and evaluation,which gives professional guidance on scientific and safe tummy time activities for infants to meet their developmental needs.