What are the characteristics of boys and girls? Revealing the top 10 folk sayings and scientific basis
Having a boy or girl has always been a hot topic for families preparing for pregnancy. Although modern medicine has been able to detect the gender of the fetus through technical means, there are still many characteristics that are used to determine the gender of the fetus. This article will combine the popular discussions on the Internet in the past 10 days to sort out 10 common characteristics of boys and girls, and attach relevant data and analysis.
1. Comparison of body shape changes of pregnant women
| feature | Sayings about giving birth to a boy | Sayings about giving birth to a girl | scientific explanation |
|---|---|---|---|
| belly shape | convex | mellow | Related to fetal position, regardless of gender |
| Waistline | The waistline is still visible on the back | waistline disappears | Depends on fat distribution |
| weight gain | Mainly concentrated in the abdomen | Even growth throughout the body | Individual differences lead to |
| Areola color | Darker | reddish | Caused by hormonal changes |
2. Comparison of differences in pregnancy reactions
| symptom | Performance of giving birth to a boy | Performance of giving birth to a girl | medical opinion |
|---|---|---|---|
| Degree of morning sickness | lighter | More serious | Related to HCG levels |
| Appetite changes | Preference for salty and sour foods | Preference for sweets | lack of scientific basis |
| skin condition | roughening/acne | become delicate | Hormone fluctuations lead to |
| Feeling of fetal movement | powerful | Gentle waves | Related to fetal activity |
3. Analysis of data statistical characteristics
According to the data of 2,000 deliveries in a tertiary hospital in 2023:
| Observation indicators | average baby boy | average baby girl | P value |
|---|---|---|---|
| Fetal heart rate (bpm) | 139.2 | 143.7 | >0.05 |
| Biparietal diameter (cm) | 9.21 | 9.03 | <0.01 |
| Femoral length (cm) | 7.12 | 6.98 | <0.05 |
| Placenta location | The front wall accounts for 62% | The rear wall accounts for 58% | >0.1 |
4. Scientifically verified sex determinants
Modern medicine has confirmed that the gender of the fetus is determined by the following biological factors:
1.chromosomal machinery: The Y chromosome carried by the male sperm is the key to the decision. The X sperm combines with the egg to develop into a female (XX), and the Y sperm combines to develop into a male (XY).
2.Effects of timing of conception: Y sperm swim faster but have a shorter survival time (24-48 hours), X sperm survive longer (72 hours), and intercourse before ovulation increases the probability of having a boy.
3.environmental factors: Research shows that high temperature environment may increase Y sperm activity, but the difference does not exceed 5%
5. Expert advice
1. The accuracy of folk feature judgment is only about 50%, which is no different from random guessing.
2. The accuracy of ultrasound examination in determining gender after 16 weeks of pregnancy can reach over 95%
3. Gender identification without medical indication is illegal in my country
4. Expectant parents are advised to pay more attention to fetal health indicators rather than gender.
Please note that the features listed in this article are for entertainment purposes only. Every birth is a miracle, and gender should not be a criterion. The latest social survey shows that parents born in the 1990s are less concerned about the gender of their fetus, with more families saying "health is good".
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