2 sperm cells hit the egg
Causes of premature birth, multiple gestation, infection,sex, fall,incompetent cervix, placenta previa, abruptio placenta and eclampsia.
Causes of premature birth, multiple gestation, infection,sex, fall,incompetent cervix, placenta previa, abruptio placenta and eclampsia.
No.
The largest number of single births to one woman without any multiple births is 69. This record is held by the wife of Feodor Vassilyev, a peasant from Shuya, Russia, who gave birth to 69 children in the 18th century.
multiple, sometimes up to ten
record for multiple births without fertility drugs
Only in Dogs. In humans and other species multiple births are cause during the ovaluation period.
The uterus of pigs has separate canals instead of a single canal. The evolutionary advantage of this is that multiple births can be performed.
From 1000 births 16.3 will be multiple according to the website linked below
53
Human normally have single births from a pregnancy, whereas the expanded uterus in cats facilitates multiple births. if your cat is pregnant, the uterus will be greatly enlarged and you may find many fetuses inside.
It takes 40 wks for a foetus to reach full term maturity in single or multiple births. Multiple births are induced earlier if there are problems.