Problem of the present invention is that the chance abuse growthdevelopmental stage that estimation Cong Lai Ji Intraoperative go out, can accurately predict that check device provides. Solution is, the growthdevelopmental stage of the above-mentioned fetus of energy variation amount described in calculating means in check device from the blood flow velocity energy variation amount of the blood flow velocity and artery for the vein that placenta enters the blood flow velocity of fetus vein and above-mentioned fetal placenta is determined towards mensuration means described in the measuring means from the blood flow velocity of the artery carries out prediction composition. In Fig. 1
