The growth and development of the fetus is characterized by the appearance of the buds first and the fetal heart later. The fetal heart buds need to be determined by ultrasound, and the fetal heart can only be heard after the buds have grown. The fetal bud is the original structure of the heart, and the fetal heart refers to the heartbeat of the fetus. Generally speaking, fetal buds appear when a woman is 40 to 50 days pregnant, and fetal heart appears when a woman is 50 to 60 days pregnant. Fetal heart and fetal buds are commonly used to determine whether the growth and development of the fetus is at a normal level. In clinical practice, pregnant women are advised to have timely pregnancy checkups at the appropriate time to observe the development of fetal heart and fetal buds, and to have regular fetal heart monitoring. If the fetal heartbeat is too slow or too fast, it is necessary to consult a doctor and take appropriate measures to intervene.