By around 4 months gestation, a fetus's internal organs are largely developed and begin functioning. By 7 months, brain activity commences, establishing a rhythmic fetal life pattern—at minimum, the fetus perceives the mother's daily routines.
This rhythm is most preferred by the fetus (Public Health Network)
The Fetus's "Morning"
Although the fetus's vision is not yet fully developed, what do they use their eyes for in the womb?
When the eye structures first form, the upper and lower eyelids are fused together. Around 25 weeks of pregnancy, the eyelids can separate, and the fetus can produce a small amount of tears.Babies don't gain full visual clarity until about 3 months after birth. In the womb, they can only perceive changes in light intensity.
Inside the mother's womb, it's pitch dark at night, and daytime light is dim—equivalent to indoor nighttime lighting. However, fetuses can sense subtle variations in light.
After 34 weeks of pregnancy, the fetus can distinguish between night and day and has begun to follow the mother's 24-hour circadian rhythm.
For the fetus, even faint light signals that it is now "morning."
The Fetus's "Biological Clock"
Every human possesses an internal "biological clock," governing rhythms like pulse, breathing, blood pressure, metabolism, and hormone secretion in 24-hour cycles.
Strictly speaking, however, the human biological clock operates on a slightly longer cycle—approximately 25 hours. This creates a one-hour discrepancy. How does the body adjust this variance?It relies on morning sunlight. When daylight arrives, our brain registers: "It's morning now." It then resets the biological clock to a 24-hour cycle.
The fetus adjusts its biological clock to a 24-hour rhythm through two mechanisms. First, it receives a hormone called "melatonin" from the mother via the placenta. Second, it senses morning sunlight.
If an expectant mother frequently stays up late, sleeps in, and wakes up late the next morning, not only does she struggle to regulate her own biological clock, but the fetus's biological clock also fails to function properly on a 24-hour cycle.
Fetuses thrive on regular routines.
For a fetus to maintain a regular 24-hour rhythm, the pregnant mother must also live a consistent lifestyle.
Irregular routines can disrupt the "biological clocks" of all organs—including the brain, heart, liver, and kidneys—disrupting bodily balance and causing significant harm. In fact, by around 4 months, a fetus's internal organs are largely developed and begin functioning. By 7 months, brain functions start operating. By this stage, the fetus has already adopted a rhythmic existence, at the very least attuned to the mother's daily patterns.
The "body clock" is also crucial, enabling the human body to live in a regular 24-hour cycle. Our brain activity requires energy, and after breakfast each morning, our body temperature rises, allowing the brain to become active. Therefore, the habit of skipping breakfast is very harmful to the body, and the consequences are even more severe for pregnant women. To ensure a regular lifestyle for themselves and to ensure a regular lifestyle for the fetus, pregnant women must eat breakfast properly.
Pregnant Women's Routine Overview
1. Sleep: At least 8 hours daily, with a 1-hour midday rest. Ensure indoor air is fresh and well-ventilated.
2. Clothing: Wear loose, warm garments. Avoid high heels, tight socks, and constricting belts to prevent impaired blood circulation and fetal development.
3. Exercise: Engage in moderate calisthenics and walking; avoid strenuous activities. Light household labor is acceptable, but avoid abdominal pressure during later stages.
4. Breast Care: Starting from the 5th to 6th month of pregnancy, wash nipples daily with soap and water. Women with inverted nipples should gently pull them outward to prevent breastfeeding difficulties after delivery.
5. Hygiene: Bathe regularly, clean the external genitalia frequently, and change undergarments often.
6. Bowel Movements: Reduced intestinal motility increases constipation risk. Drink ample water and consume plenty of vegetables and fruits. Establish a regular bowel routine. Use only mild laxatives for constipation to avoid uterine contractions.
7. Medication: Many drugs can cross the placenta into the fetus, especially during early pregnancy when teratogenic risks are higher. Medication use must be cautious. The correct approach is to take medications appropriately under a doctor's guidance based on the condition.
8. Mental Health: The mother's mental state during pregnancy directly affects fetal development. Therefore, maintain a calm and pleasant mood, avoid agitation or anger, and lead a regular, tranquil life.
Friendly Reminder
A Regular Routine Matters
Even while the fetus is in the womb, the mother's daily rhythm begins to influence the baby and lays the foundation for its biological clock after birth.
Children born to mothers who habitually wake early tend to develop early-rising habits themselves, while those born to mothers who stay up late often exhibit delayed sleep patterns. To foster healthy future routines, expectant mothers should prioritize consistent rest, aiming for early bedtimes and mornings.Daily moderate exercise, such as prenatal exercises, is essential. If an expectant mother leads an irregular lifestyle—meaning irregular meals and sleep patterns—she may miss meals when she should eat or be unable to sleep when she should rest. Working while others are resting or eating can directly affect fetal development, potentially leading to developmental abnormalities or miscarriage.
Therefore, maintaining a regular routine during pregnancy is crucial to ensuring the fetus develops with a normal biological rhythm.