A flat and smooth measuring surface composed of a durable material, such as plastic or metal, is typical of infantometers. To guarantee the baby's comfort throughout the measuring process, the surface is frequently padded or cushioned. Along the length of the surface, the instrument has a measuring scale or tape calibrated in centimetres or inches. The healthcare practitioner then carefully positions Infantometers to touch the top of the baby's head and the bottom of their feet as they extend the measuring scale or tape along the length of the baby's body. The measurement is taken by noting the place on the scale where the baby's feet touch.