Baby boy or baby girl?
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?