The inner cell mass is present, and extraembryonic membranes are forming. At the end of the first month, organs are developed and the placenta is forming. Limb buds are present, and eyes, ears, and a nose appear. During the first two months, the mother may experience nausea, breast tenderness, fatigue, and other symptoms. At the end of two months, the embryonic stage is over.
Fetal development extends from the third to the ninth month.
Bone is replacing cartilage. During this time, it becomes possible to distinguish males from females. The mother can feel fetal movement. The fetus's thin skin is covered with lanugo, and the eyelids open fully. At the end of seven months, the fetus can survive if born prematurely.