The Sperm's Long Journey. A man may ejaculate 40 million to150 million sperm, which start swimming upstream toward the fallopian tubes on their mission to fertilize an egg. Fast-swimming sperm can reach the egg in a half an hour, while others may take days. The sperm can live up to 48-72 hours. Only a few hundred will even come close to the egg, because of the many natural barriers that exist in a woman's body.
9.4 Giving birth. Normal delivery. Children that are born between the 36th and 39th week (38 and 41 weeks after the LMP) are considered as being normal deliveries. Statistically, only 2/3 of all children are born within the 3 weeks around the calculated date of birth and around 80 % within a month around the predicted date of birth.
As the pregnancy progresses, the survival rate continually improves, with the rate of complications gradually falling. By the end of 27 weeks, the survival rate nears 90%. Survival, however, is not enough to consider it a âsafeâ time to give birth. A majority of babies born after 32 weeks of pregnancy will not have lasting difficulties. By 37 weeks, most babies will be released from the hospital just like full-term babies, requiring no extra care. This is the time at which I would consider it safe to give birth.