Therefore, the only way to know if you have gone through menopause is if you have not had your period for one year. (And it's not menopause if your periods stop for some other reason, like being sick.) The average age of menopause is 51, but for some women it happens as early as 40 or as late as 55. After you go through menopause, you are considered in the post-menopausal stage of your life.
The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the zygote). It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.
The embryo and placenta grow side by side and are attached via the umbilical cord - the placenta attaches to the uterine wall as it develops after the embryo implants in the uâ¦terine lining. Some women have spotting and slight cramps when the embryo attaches to the uterine lining. 1 person found this useful.