A newborn / baby long body circumference measuring ruler has a measuring ruler body and a bendable insert. The measuring ruler body is elongated and retractable, and has a front end and a rear end. The front end has a front edge and a rear end. The end has a rear edge, the scale body also has a first surface and a second surface, and the first surface and the second surface face each other. The first surface has a first length unit scale and a first length unit. The scale has a starting point of the first scale, and the starting point of the first scale is a distance from the front edge； a bendable insert piece is embedded in the front end of the scale body, and the bendable insert piece extends from the front edge to beyond the start point of the first scale. . With this creation, the length, head circumference, chest circumference, and abdominal circumference of a newborn / baby can be measured accurately, and the cost is low and the safety is high.一種新生兒/嬰兒身長體圍測量尺具有一量尺本體與一可彎折嵌片，量尺本體為長條狀且可捲收，具有一前端及一後端，前端具有一前端緣，後端具有一後端緣，量尺本體還具有一第一表面與一第二表面，且第一表面與第二表面彼此相背，第一表面上具有一第一長度單位刻度，第一長度單位刻度具有一第一刻度起點，且第一刻度起點距前端緣有一距離；可彎折嵌片嵌於量尺本體的前端，可彎折嵌片自前端緣延伸至超過第一刻度起點。藉由本創作能正確測量新生兒/嬰兒的身長、頭圍、胸圍、腹圍，且成本低、安全性高。
