Cardiotocography (CTG) is widely used for management of delivery and monitoring of fetal well-being in latter pregnancy. Because conventional CTG uses a continuous-wave Doppler system, it is difficult to apply it to relatively small fetuses in early pregnancy. Much more precise estimation of fetal heart rate is required in CTG. Moreover, qualitative measurement of fetal movement is also required from the point of view of fetal well-being. In this paper, we discuss a new fetal-behaviogram for monitoring of fetal well-being from middle pregnancy that we developed. It can measure information such as fetal heart rate, fetal movement, and fetal breathing movement. The hardware for this system consists of a LSI for the fetal monitor, which can measure 20ch complex Doppler signals in the depth direction using a new digital IQ detector based on Fourier analysis, transmitting wave generator, ultrasonic controller, and buffer memory. Two ultrasonic transducers for a fetus in middle pregnancy have been newly designed to reduce the blind region in the shallow depth. We also developed a robust and precise estimation algorithm for fetal heart rate and displacement of fetal breathing movement using a filtered arc-tangent method.