In early pregnancy, due to the change of hormone level in the body, the weakened peristaltic function of the gastrointestinal tract and the reduction of gastric acid secretion, pregnant women may experience a series of changes such as nausea, vomiting, loss of appetite, change in diet structure and habits, which are normal early pregnancy reactions. Can not eat in the first trimester of pregnancy, may have the following effects on the fetus: 1, long-term failure to eat will lead to nutritional deficiencies of pregnant women, which in turn increases the probability of miscarriage, premature birth, stillbirth, low birth weight babies, neonatal death, deformities and other conditions. At the same time, malnutrition in pregnant women will also lead to fetal growth and development in the womb is limited, affecting intellectual development. Especially in the first trimester, it will affect the brain development of the fetus, such as abnormal development of the nervous system will lead to fetal unresponsiveness, mental retardation; 2, the first trimester of pregnancy has been unable to eat may also make the pregnant woman electrolyte disorders, which will endanger the health of the fetus in the body. And serious electrolyte disorders can lead to cardiac arrest or cardiac arrhythmia because of the impact on the heart function of pregnant women, this abnormal heart disease can lead to the body of the fetus lack of oxygen, and in serious cases even endanger the life of the fetus.