parents at Child Development

The big news from the latest report on births from the Centers for Disease Control and Prevention (CDC) is that American women are having more babies! The U.S. birth rate jumped 3 percent from 2002 to 2004, to more than 4.1 million births — the highest number since 1962 (except for a brief spike in 1990). The United States is now boasting climbing birth rates again, following the baby decline of the 1990s.
It is very interesting for me what is going on in the world? Why demographic situation is so different all over the world? I know it depends on religion and wealth of nation.
For example in some countries of Africa and the Muslim countries the religion encourages a plenty of children in family. Abortions can be forbidden in general. China has the other problem. The government forbids having more than one child in family even if parents wish to have more children. Except for that many Chinese people wish to have the son because he continues the dynasty. Most of them when they find out that they will have a girl do the abortion. So there’s gonna be a huge problem very soon. Quantity of boys is growing too fast. It is really bad.
About wealth. Unites States is a rich country and it’s population is growing now. But there are a lots of rich countries in Europe. And I know that demographic situation is not very good there. Why it is so different? Why it is going on this way?

There are some theories…

Weight theory
Italian scientist Angelo Gagnacci studied about 10000 women recently confined and found out that women’s weight can influence the sex of baby. If the woman before pregnancy was less than 54 kg (113 lbs) she probably will give birth to a girl. Among women in this weight category every hundred newborn girls is accompanied by 98 newborn boys. Among women that weight more than 54 kg correlation is another: 110 boys and 100 girls. Probability of delivering a boy increases.
Gagnacci thinks that the boys are usually bigger and it’s harder for miniature women to give them birth. The nature took care of them in this way.
Theory of blood renewal
This method is based on terms of blood renewal. Men’s blood renews once in 4 years, women’s once in 3 years. Sex of a baby depends on whose blood is “younger” – mom’s or dad’s. You have to take into consideration big blood losses – operations, childbirth, donating the blood. After that the term begins from 0.
Age theory
They say that the correlation of age of parents can influence child’s sex. In families where husband is older than wife (5-17 years) it is more probable that first baby will be a boy. In families where the situation is reverse a girl has more chances.

To my mind only theory of blood renewal is worth attention. Other theories are not so convincing. I get different results according to them. And what about you?

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