Tammy M. Swinson

Essentials of Health Care in the First Month of Pregnancy

Fetal changes 　　 The first month of pregnancy is the fetal bud period, and the growth rate of new life during this period is the fastest in its life. The sperm and egg combine at the second weekend of pregnancy. About 4 days after fertilization, the sperm and egg split into cell masses to reach the uterus along the fallopian tube. In the third week, the cell mass shed its outer membrane to prepare for implantation. In the fourth week, the blastocyst has been firmly implanted in the uterus. Almost all prototypes of the fetal nervous system and blood circulation organs have appeared in this period. The liver has developed significantly since this period. The prototypes of the eyes and nose have not yet been formed, but the prototypes of the mouth and chin can already be seen and are connected to the mother's body. The umbilical cord also begins to develop from this period.