The success rate of fresh embryo 6c is lower, but the final success rate is related to maternal hormone levels and intrauterine conditions in addition to embryo quality. Fresh embryo 6c refers to the embryo after 2~3 days of fertilization with six cells. According to the growth rate, cleavage pattern and embryonic cell fragmentation, 6c embryos can be classified into grades A, B, C and D. Grade A is of the highest quality and has a higher success rate, while fresh embryo 6c has a lower success rate. To have a high success rate, the mother needs to have sufficient estrogen and progesterone before the transfer and the endometrium is thick enough for the embryo to settle. After the transfer, the mother needs to rest in bed, and should not do weight-bearing on all four limbs or drastic changes in body position to avoid affecting the embryo’s implantation. Ultrasound of the uterine cavity should be done 4-6 weeks after the transfer to see if there is a gestational sac and fetal heart buds to determine whether the embryo is successfully implanted. In the early stage, oral folic acid and progesterone are also needed to protect the fetus, and regular obstetric examination. If there is any discomfort, consult a specialized obstetrician for treatment.