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The baby react to the mother's behavior before they birth. For the baby's development, mother try to interaction with the fetus during pregnancy. However, as often as not, mothers can’t develop bond with a fetus. Until now, prenatal care is unilateral communication. This device helped to form a smooth communicate system between the fetus and the mother. By analyzing the fetal heart rate using an ultrasonic wave, it tells us the feeling of the fetus to the mother.