After implantation in the mother's body, the fetus begins cell division and gradual growth and development. Fetuses actually have their own developmental indicators at different stages. Being too advanced is not good, and being too backward is also not good. So what are the developmental standards for fetal size at different stages? Listen carefully to the editor's explanation.
The first month
The first month refers to the time within four weeks from the first day of the last menstrual period for pregnant women.
Physiological characteristics:
If the menstrual cycle of a pregnant woman is 28-30 days, the sperm and egg will combine on the second weekend of pregnancy. After about 4 days of fertilization, the sperm and egg that divide into cell clusters travel along the fallopian tubes to reach the uterus. In the third week, the cell mass sheds its outer membrane to prepare for implantation. The fourth week embryo has been firmly implanted into the uterus.
The period from three weeks of pregnancy to four weeks of the first month of pregnancy is called the embryonic stage. The fetal bud is 0.5-1 cm in shape like a small seahorse.
The second month
Physiological characteristics:
In the second month of pregnancy (5-8 weeks), the embryo develops into an embryo. Embryos have a body and can distinguish the small ridges on the eyes, hands, and feet, which are the future fingers and toes. This month is the differentiation and formation period of the majority of fetal organs, also known as the embryonic organ formation period.
At the 5th week of pregnancy, the neural tube of the embryo gradually forms. These neural tubes will develop into the brain and spine in the future.
At around 7 weeks of pregnancy, the fetus measures 2-3 centimeters in length and weighs about 4 grams. It has already grown hands, feet, eyes, ears, and mouth, and its facial features have begun to resemble those of a human.
The third month
Physiological characteristics:
The third month refers to the four weeks starting from the ninth week.
At the end of the tenth week of embryonic development, it enters the fetal stage. The fingers and toes are clearly visible as the placenta begins to form and the umbilical cord gradually lengthens. By the end of the eleventh week, the pregnant woman's uterus was as big as a fist. If you press around the uterus, you can feel its presence. At this time, the fetal genitalia are formed.
The fetus's body grows by one millimeter per day and by the end of the third month, it has grown by nine millimeters.
The fourth month
Physiological characteristics:
The fourth month refers to the four weeks starting from the thirteenth week of pregnancy. At this point, the fetus's eyes, ears, and nose have fully formed. The placenta has also matured and the mother and fetus are closely integrated.
The high-risk period for miscarriage has basically ended. This month to July is the most stable period.
By the time the fetus reaches sixteen weeks, its body length is about eighteen centimeters, which is approximately the same as the mother's palm and weighs about 120 grams. The fetus floats back and forth in amniotic fluid like an astronaut in space.
The fifth month
Physiological characteristics:
The fifth month refers to the four weeks after the seventeenth week of pregnancy, during which the fetal motor and sensory nerves have begun to develop and show subtle muscle activity. The liver begins to produce blood, and the whole body begins to grow long hair and nails. The fetal length is 23-25 centimeters and the weight is 250-300 grams.
The sixth month
Physiological characteristics:
At the sixth month after reaching twenty weeks of pregnancy. The fetus in this stage has grown hair, eyebrows, eyelashes, and bones that are already very strong, but there is no subcutaneous fat, so it is very thin. The fetus can freely move its body position in sufficient amniotic fluid, even with its head down.
The fetus is about 30 centimeters long and weighs about 650 grams.
The seventh month
Physiological characteristics:
During this period, the fetal eyelids are already open and there are sleeping eyelashes. The fetal brain has also developed and the sensory system has significantly developed. The fetus's eyes begin to be sensitive to the brightness of light, and their hearing also develops. However, auditory development is not completed until the eighth month of pregnancy. The body length is 35-38 centimeters and the weight is about 1000 grams.
The eighth month
Physiological characteristics:
At this point, the fetus is close to maturity and can survive even outside the mother's body. His small body has developed small muscles, and his legs are kicking and bouncing more vigorously than before. The auditory system is fully developed at this time. By the 30th week of pregnancy, fetal brain waves can be seen. At this point, the consciousness activity of the fetus begins to sprout. The fetal head slowly moves downwards towards the uterus to prepare for birth.
The fetal length is about 40 centimeters and the weight is 1800 grams.
The ninth month
Physiological characteristics:
The ninth month refers to the four weeks of pregnancy after reaching 32 weeks of gestation.
At this point, some parts of the fetal brain have not yet matured but are already quite developed. He/she not only responds to external stimuli with whole body movements but also with facial expressions, showing changes in likes or dislikes.
This month's fetus begins to respond to light from outside the mother's body.
The various organs in the fetus's body have matured and become round with shiny skin. The length is about 45 centimeters and the weight is about 2500 grams.
The tenth month
The baby is born!
This article provides a detailed introduction to the developmental characteristics of babies at different stages. As a pregnant mother, it is best to carefully understand the developmental characteristics of each stage of your baby. This way, your baby can develop and grow better under the attention of your mother, and you can actively take correct measures to cope with different stages of your baby's development.
