Nail oximeter can only be used for adults, because the baby's blood perfusion index is relatively low and his fingers are relatively small, so he can't hold the displayed data. You can only choose the binding method and tie it to the sole of your foot or palm. You can use Likang's 100F oximeter for detection, or you can use imported masimo, but the unit price is very high. Household auxiliary measurement, Likang 100F oximeter.