In the delivery room, after every newborn is born, the doctor will weigh and measure the height of the baby, and record it in the newborn manual. Many mothers will find that the height of many babies will be marked as 50cm. Do you know what's going on?
Why are most newborns 50cm?
After pregnancy, the uterus of pregnant women gradually increases with the increase of months.
Before pregnancy: the pregnant woman's uterus is only the size of xiaoyali, with a volume of about 7 * 4.5 * 3.5cm and a weight of 50g.
3 months of pregnancy: the size of the uterus has changed, it looks like a grapefruit, and the bottom of the uterus can be touched. On the pubic symphysis, the enlarged uterus will feel pressure on the bladder and rectum, and pregnant women will feel frequent urination or unclean urine.
At the fourth month of pregnancy: due to the accelerated growth of the fetus, the uterus has slowly grown out of the pelvis, and the ligaments around the uterus will become more and more tense. Some pregnant women will feel one or both sides of the lower abdomen uterus with abdominal pain, such as pumping pain, distending pain and falling sensation.
At the 10th month of pregnancy: before labor, the weight of the uterus is 1000 grams, which is 20 times higher. It can hold about 5000 ml of fetal and amniotic fluid. The full-term uterus is 35 cm long, 25 cm wide and 22 cm thick.
In short, the length of the pregnant mother's uterus at the time of delivery is about 35 cm. And a fetus, curled head and limbs, basically about 35 cm in length. Therefore, in order to adapt to survival, the fetus can not grow too high in the womb, otherwise, the mother's womb will not bear.
The standard height range of normal newborns is 45.2-55.8cm for male babies, with an average of 50.4cm; 44.7-55.0cm for female babies, with an average of 49.7cm.
The baby's height in this range, weight in 6 Jin or so, prove that the baby's health is good, the probability of adverse diseases is smaller, later will be more healthy and smart.
What is the relationship between the birth height and the final height of the newborn
The first height development peak of a child is before the age of 1-3. If the child's birth height is not high and is fed well after birth, most of them can catch up with the height curve level of normal children at the age of 2.
Baby's height at the age of 2 is 80% related to her final height. From birth to the age of 2, a baby's height is generally 37 cm long, of which 1 / 3 is completed before 4 months, 5-12 months and 1-2 years respectively.
Genetic influence on height accounts for 70%, but in the acquired development, there are individual differences. Such as sleep, nutrition, disease, exercise, environmental impact accounted for 30%. If parents want the baby to grow tall, they need to work hard in the above aspects, and can't let the baby lose at the starting line.
1. Breastfeeding
Breast milk is a safe, natural and complete food for infants. It not only contains all kinds of nutrients and antibodies that infants need for growth, but also is easy to digest and absorb. If you want to have strong milk secretion and good nutrition, lactating mothers should eat more nutritious food to ensure the quality of breast milk.
2. Ensure good sleep quality
The baby sleeps most of the time every day, which is the need of physical growth and development. If the baby does not sleep enough, it will have an impact on health, such as lack of sleep, resulting in low growth, low immunity, irritability and so on. The mother should help the baby to develop good sleep habits, which has been well trained since childhood.