The effect of fetal preservation on the fetus is not significant, fetal preservation requires the use of fetal preservation drugs, such as progesterone, dydrogesterone, vitamin E, etc. In the middle of pregnancy, fetal preservation requires the use of magnesium sulfate, which will not affect the development of the baby, it is safer to take the drugs under the guidance of a doctor in a reasonable manner. If the use of improper drugs will affect the baby’s development, in order to be safe need to regular maternity checkups to see the development of the fetus, early pregnancy birth control needs to be kept until about 3 months of pregnancy, in order to keep the baby successfully. In the early stages of pregnancy, you need to take proper bed rest, not to do strenuous exercise, and not to have sex in the early stages of pregnancy, so as not to cause miscarriage. It is best to eat more fresh vegetables, fruits and protein-rich foods, such as fish and shrimp, lean meat, milk and other foods, which can promote the development of the fetus.