1 Preseed maintains this alkalinity while other vaginal lubricants tend to have pH values below 7.0 and as low as 3.5 (very acidic and deadly to sperm.  Osmolality Ã¢â¬â Semen has a specific particle concentration that keeps sperm motile and healthy.
Causes of instantaneous or sudden death. Instantaneous or sudden death may result from dysfunction/abnormalities of the heart and its vessels, noncardiac vessels, pulmonary system, and central nervous system (CNS).
The interaction between smoking and low volume of blood retained by the cells during pregnancy, leading to chronic hypoxia (low levels of oxygen in the blood), appear to increase the risk of sudden infant death syndrome. Sudden infant death syndrome is the primary cause of death in healthy babies in the US.