If the gestational sac is small, but the fetal heart and buds are normal, it is usually fine, but there are also cases of fetal dysplasia. The small size of the gestational sac, with fetal heart and buds development mostly indicates the survival of the embryo, the small size of the gestational sac may be due to the usual menstrual cycle is not too regular, in this case is normal. However, the small size of the gestational sac may also be caused by the delayed development of the embryo, there is a possibility that the embryo stops developing, which may be abnormal. To summarize, if the gestational sac is small, but there is fetal heart and bud development, you need to do regular ultrasound to review the size of the gestational sac, and judge whether it is normal or not based on the results of the review. If the gestational sac continues to grow and the fetal heart and buds develop normally, no special intervention is needed and the pregnancy can continue. If the size of the gestational sac continues to shrink, it is recommended that the pregnancy be terminated under the guidance of a doctor.