When an artificial insemination (AI) cycle is performed, an attempt is made to mature 1-2 eggs. This is intended to increase the probability of pregnancy, while keeping the probability of multiple pregnancy as low as possible.
When more than one egg matures, a twin pregnancy is possible, although multiple pregnancies can also occur if a single egg is fertilized and divides naturally into two to produce twins.
In any case, this type of pregnancy carries more risks than singleton pregnancy. Among the possible complications of multiple pregnancy are: premature delivery and low birth weight, in relation to the fetus, and gestational diabetes and preeclampsia, in the case of maternal health.