Probably almost all the parents would like to know how to choose the date of conception, that is they had a boy or a girl. There is the so-called method of "Blood Pack" is based on the fact that the blood of men is updated every 4 years, and for women - once every 3 years. Do any of the parents blood "newer" at the time of conception of the child, this floor will be a future child. It is necessary to take into account all of the great loss of blood, after which the blood updated - surgery, childbirth, miscarriage, abortion, blood transfusion, blood donation, etc.
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