Human Pregnancy Lasts About 40 Weeks
It is called pregnancy, pregnancy or pregnancy (from the Latin gravitas) to the period between implantation in the uterus of the fertilized egg and the time of delivery. Covers all the physiological processes of growth and development of the fetus inside the womb, and the important physiological changes, including metabolic and morphological occur in women designed to protect, nurture and enable the development of the fetus, such as disruption menstrual cycles, or increasing the size of the breasts to prepare for lactation.
In humans, pregnancies tend to be unique, although there may be multiple pregnancies. The application of assisted reproductive technologies is pushing up the incidence of multiple pregnancies in developed countries .
Human pregnancy lasts about 40 weeks from the first day of the last menstrual period or 38 from fertilization (approximately 9 months). The first quarter is the time of greatest risk of spontaneous abortion, the beginning of the third quarter is considered the point of fetal viability (the one from which Ex utero can survive without medical support).