It cannot be called a fetus at 60 days of pregnancy, when the size of the embryo is about 18 to 22 mm or so, but there are individual variations. A human embryo within 70 days of gestation is called an zygote. Early pregnancy can be seen as early as 35 days after menopause when the intrauterine gestational sac is visible on ultrasonography and a normal pregnancy is defined, and fetal buds and primitive heart tube pulsations can be seen at about 42 days after menopause. At 60 days of menopause, the size of the embryo is about 18 to 22 mm, and the gestational week can be checked according to the fetal buds, etc., but there will be some individual differences. When the ultrasound examination in early pregnancy suggests that the embryo development is on the small side, it should be combined with the test levels of progesterone, blood HCG (human chorionic gonadotropin) and estradiol, etc., and the doctor should give progesterone, low molecular heparin and other medications to protect the fetus, and repeat the ultrasound examination and the water of progesterone, HCG and estradiol to know the development of the embryo in the first week after treatment.