A nonstress test isnot a routine test done by everyone. It is for situations such as if your baby is not moving so much. There's a machine called the Cardiotocography (CTG) where you use a sensor on the tummy while the other probe measures the contraction. If the probe shows that baby is sleepy and not moving much, we usually try to stimulate the baby to see if the baby wakes up. his simulation can be done by movement tapping or using a sound as a buzzer to buzz onto the abdomen to stress the baby and see whether the baby moves and react.