From the mercy of God and his creation in human beings and other creatures that make pregnancy in the fetus undergoes stages of growth and development in a manner consistent with the developments that touch the vital organs in the body of the mother, each stage of the development of the fetus within the uterus is accompanied by a series of developments in the body of the mother,
- The first stage is the period from the first day of pregnancy, in which the egg is fertilized by a sperm cell and continues until the end of the fifth week. At this stage, the egg is divided into several cells that gradually develop until the fetus is about half a centimeter long.
- The second stage, which extends from the sixth week until the end of the tenth week, and in this period begins the heart of the fetus, which will be divided into two parts Pulse also forms at this stage the umbilical cord that connects the fetus with the mother’s bread to get through the food necessary for growth, and begins to form the head and the openings of the ears and eyes Nose, and start breathing process for the first time.
- The third stage, which extends from the eleventh week of pregnancy until the end of the fifteenth week, where the heart of the fetus begins at this stage pumping blood to the rest of its forming organs. It also begins with vital processes such as yawning, sucking of fingers and swallowing of saliva. Its genital organs, fingers and toes also grow significantly And start to listen and distinguish the voices, and show the nails and bones and other muscles, and starts moving his legs and arms, and begins to appear on the hair for the first time and up to a length of about twelve centimeters.
- Phase IV: extends from the sixteenth week of pregnancy until the end of the twentieth week, showing at this stage in the fetus eyelashes and eyebrows, and is formed for the first time under the skin of the skin of grease, and begins to form the skin has a tangible, and that the nervous system begins for the first time growth and formation and arrive It is about 17.5 centimeters long.
- The fifth and final stage is the period from the 21st week until the end of the fortieth week – the birth – where the fetus continues in this period of growth and formation, and all of its members and vital functions peak completion and readiness to receive life, and lungs are in particular ready to perform the function of breathing independently The mother has an approximate weight of about three and a half kilograms, which increases or decreases from one embryo to another, and also reaches a length of about forty-eight centimeters, which increases or decreases from one child to another.