Normal fetal development standards, expectant mothers want to have a healthy baby, so whether the fetus develops normally in the abdomen is the most concerned thing for expectant mothers. There are many reasons that affect fetal development. The following are the criteria for normal fetal development.
Fetal normal development standard 1 fetal development standard at all stages
Four weeks is a stage, and every four weeks is a pregnant month. At the end of 8 weeks, the embryo begins to take human form, and the head accounts for more than half of the body. At the weekend of 12, the fetus is about 9 cm long and weighs about 14 g, and some of them can distinguish sex and limb movements.
Comparison table of fetal weight standard value
With the increase of fetal weeks, fetal weight increases in direct proportion, but at the same time, there are certain rules. We can judge whether the fetal development is normal, too big or too small through the following standard comparison table of fetal weight and gestational age.
Eight weeks pregnant, 1g, nine weeks pregnant, 2g, 10 weeks pregnant, 4g.
1 1 week, 14g, 12 weeks, 16g, 13 weeks, 20g.
Pregnancy 14 weeks, 20g, pregnancy 15 weeks, 50g, pregnancy 16 weeks,150g.
17th week, 150 to 200g,18th week, 200g,19th week, 15cm, 200g to 250g.
20 weeks pregnant, 280 grams pregnant, 2 1 week pregnant, 300 to 350 grams pregnant, 22 weeks pregnant, 350 grams pregnant.
23 weeks pregnant, 400g, 24 weeks pregnant, 500g, 25 weeks pregnant, 600g.
26 weeks pregnant, 800g, 27 weeks pregnant, 900g, 28 weeks pregnant, 1200mg.
29 weeks pregnant, 1300g, 30 weeks pregnant, 1500g, 3 1 week, 2000g.
32 weeks pregnant, 2000 grams, 33 weeks pregnant, 2200 grams, 34 weeks pregnant, 2300 grams.
35 weeks pregnant, 2500 grams, 36 weeks pregnant, 2800 grams, 37 weeks pregnant, 3000 grams.
3200 grams at 38 weeks, 3200 to 3400 grams at 39 weeks and 3200 to 3400 grams at 40 weeks.
Comparison table of fetal weight and month
65438+ 10 June, just implanted, is a cell with negligible weight. The weight in February is about 2g, and in March it is about14.17-28.35g. After that, the weight gain is relatively fast. Weight is about 170- 198g in April, 453.6g in May, 793.8-907. 18g in June,10 in July, and the weight in August .10086.0000000000107
How to calculate fetal weight
Using the equivalent formulas of fetal biparietal diameter, abdominal circumference, head circumference and femoral length on the B-ultrasound checklist, the fetal weight during pregnancy can be calculated.
Common calculation formulas are:
Formula 1: fetal weight (g) =BPD (cm) ×900-5000.
Formula 2: Fetal weight (g) = 1.07× BPD (cm )× bpd (cm) +0.3×AC (cm )× FL (cm).
Formula 3: Fetal weight (g) = 17 1.48* abdominal circumference (AC) -2686.60.
Formula 4: Fetal weight (g) =747.42* femur length (FL) (cm) -2232.56.
In addition, it can also be estimated by the uterine height and abdominal circumference measured during the physical examination during pregnancy. The formula is: fetal weight (g) = uterine height (cm) * abdominal circumference (cm) 200 (where the fetus is in the basin: +200g, and the fetus is not in the basin: -200g).
Fetal normal development standard 2 What factors will affect fetal development?
1, drug factors:
There are many drugs (such as ethanol, phenobarbital, etc. ) can cause human fetal growth retardation; Anti-tumor drugs such as methotrexate and cyclophosphamide can cause various malformations. Moreover, long-term injection of streptomycin during pregnancy will interfere with the development of fetal auditory organs and lead to congenital deafness. In early pregnancy, long-term use of sex hormones can interfere with the normal differentiation of embryonic reproductive system, and even lead to abnormal reproductive system.
2. Smoking and drinking:
Excessive drinking during pregnancy can cause a variety of deformities, mainly manifested as growth retardation, small head, small eyes, short eye fissure, small eye distance, mental retardation, heart and joint deformities, etc. According to some data, the rate of fetal growth retardation is 7% ~ 8% for light and moderate drinkers during pregnancy; The incidence of fetal growth retardation in heavy drinkers can be as high as 27%.
3. Maternal diseases:
Any chronic wasting disease of the mother will adversely affect the growth of the fetus. Anemia, heart disease, chronic glomerulonephritis and other diseases caused by maternal hypoxia can lead to fetal growth retardation, even abortion and even death.
4, radiation and radiation:
If mothers often watch mobile phones and play computers during pregnancy, the radiation of mobile phones and computers will have an impact on the fetus. Improper radiation exposure can lead to fetal abortion, deformity and mental retardation.
2. Can music prenatal education promote fetal development?
Then we need to listen to music often, instead of listening to some DJ or some stimulating music that doesn't pay attention to the health of the fetus. We can listen to some soothing music appropriately to stimulate the development of the fetus in time.
Formal music prenatal education, such children show comparative advantages in language, concentration and sensibility after birth. We need to carry out some correct music prenatal education in time, and we need to carry out some music prenatal education regularly and patiently.
In our daily life, we need to replenish our nutrition in time, and we need to pay attention to our own health in time. Therefore, in our daily life, women need to pay attention to replenish their nutrition in time to meet the absorption of the fetus and the development of the body, and we need to exercise in time.
Matters needing attention
It is necessary to ensure adequate sleep time in daily life and pay attention to it in time. Don't exercise regularly, but exercise in time, and regularly supplement prenatal education with some music.
3. How do you know if the fetus develops well in the first trimester?
In the early pregnancy, the growth rate of fetal gestational sac can be seen through B-ultrasound examination, so as to judge whether the fetal development is good or not. Embryos develop very rapidly. By the seventh week, the fetal brain, important internal organs, hands, feet and limbs of the embryo have all formed. From the ultrasound, we can see the fetal heartbeat and confirm the fetal activity.
Pregnancy 1 1 week, the fetus has a human form, which can distinguish the head, body, limbs, hands and feet of the fetus; There will also be drinking amniotic fluid and peeing. During the period from 1 1 to 12 weeks, we can see that the human body outline of the fetus is clearer, and the details of the limbs are more complete with the body and important internal organs, and even the movement of the fetus in the gestational sac can be seen.
Basically, fetal heart sounds will not be heard until the gestational age is older, at least 12 weeks. As the uterus gets bigger and bigger, it will leave the pelvic cavity and move upwards, so it is possible to hear fetal heart sounds.
Normal fetal development standard 3 What is fetal growth retardation?
Fetal growth retardation means that the birth weight of the fetus is lower than the hundredth or two standard deviations of the average weight of the same pregnancy. If the gestational age has reached 37 weeks and the newborn's weight is less than 2.5kg, it is also called intrauterine growth retardation.
For high-risk pregnant women, we should check as early as possible to find diseases that affect the growth and development of the fetus, such as pregnancy-induced hypertension, so as to have enough time for treatment before the fetus is damaged.
Causes of fetal growth retardation
The causes of fetal growth retardation include the following three aspects.
Pregnant woman factor
1, the difference of fetal weight is related to pregnant women's pre-pregnancy weight, gestational age and parity. If the weight before pregnancy is less than 54kg, and the weight during pregnancy is too small or too large, the probability of intrauterine growth retardation will increase.
2. Malnutrition of pregnant women, especially protein and insufficient energy supply, long-term hypoxemia or low oxygen transport capacity, pregnancy complicated with chronic vascular diseases such as kidney disease, severe anemia, severe heart disease, pregnancy-induced hypertension syndrome and chronic hypertension, affects the blood flow and function of uterus and placenta, leading to fetal malnutrition, and immune diseases, endocrine diseases and infectious diseases can all affect fetal growth and development.
3, pregnant women smoking, drinking, drug abuse and other bad habits, as well as poor socio-economic conditions, the incidence of intrauterine growth retardation has also increased.
Fetal factor
1. The fetus suffers from hereditary diseases or chromosome history, and intrauterine growth retardation occurs earlier, such as abnormal chromosome number and structure. The trisomy syndrome and Turner syndrome of 2 1, 18 or 13 are more common.
2. Pathogenic microorganisms such as bacteria or viruses, such as fetal rubella virus, cytomegalovirus, herpes simplex virus, Toxoplasma gondii and Treponema pallidum. Will lead to intrauterine growth retardation.
3. Twin pregnancy can also lead to intrauterine growth retardation.
Placenta and umbilical cord factors
Placental infarction, inflammation, dysfunction, too long, too thin, knotted and twisted umbilical cord are not conducive to fetal nutrition, and can also lead to intrauterine growth retardation.
What about fetal growth retardation?
1. High-risk pregnant women should be examined as early as possible, so as to find out pregnancy-induced hypertension and other diseases that affect the growth and development of the fetus as early as possible, so as to have enough time for treatment before the fetus is damaged.
2, increase uterine blood flow, such as the left lateral position.
3. Eliminate all factors that may lead to fetal growth retardation, such as smoking, drug abuse, malnutrition or partial eclipse. Diet should follow a high-protein diet and strengthen nutrition.
4, intermittent oxygen inhalation, each time 65438 0 h, 2-3 times/d. ..
5, fetal system monitoring, such as regular or weekly fetal heart monitoring or ultrasound. NST at least 1 time per week. If NST does not respond, OCT should be performed. If OCT is positive, pregnancy should be terminated as appropriate. Ultrasonic monitoring of amniotic fluid index or maximum depth of sheep pond, weekly 1 time.
6, found that the problem needs to be induced as soon as possible should be carried out in hospitals with better medical conditions.