Fertility medications can cause the detachement of the placenta from the uterus, gestational diabetes, a miscarriage on the third trimester. In vitro fertilization procedure increases the risk of the development of placenta in the lower part of the uterus, the detachement of the placenta, possible high blood pressure.

Some studies showed that multiple births increase the death rate caused by pregnancy. The circumstances that lead to death in this case are infections, embolism (blood clot), hemorrhage (excessive bleeding), high blood pressure.

Babies conceived with the help of assistant reproductive technique are inclined to be born before the due term and to have a very low weight at birth. This items can subsequently cause lung and heart conditions or learning and growing disabilities.

A study performed in 2006 shows that children conceived as a result of in vitro fertilization procedure present the risk of cerebral palsy, a brain disease that prevents muscle coordination.

As you can see there are several risks associated with multiple birth that is why a couple must decide what they wanna do in case the treatment prodeces more than one embryo. They can choose to keep all of them and try to deliver of but this represents a high risk for the mother and the child's health. Another choice would be the reduction of the embryo's number but in this case a damage to the remaining embryos is possible.

The solution recommended by the specialists is the limitation of the number of embryos before implantation. Two or three embryos are implanted and the rest can be frozen for further use. Frozen embryos are as good as normal embryos and don't cause any problem for the development of children conceived with them. Even though the reduction of embryo lowers the success rate, it's more safe to proceed this way because the risk of multiple pregnancies is significantly reduce. Other methods of reducing the risk of multiple births are diminishing the dosage of fertility medications and blastocyst transfer.

Recent studies show that ART is a very good solution for couples unable to conceive. The success rate of ART is about 94%. The risk of chromosomal damage or birth defects is not increased by ART, couples who undergo ART could have other factors like age or genetic factors that might bring about complications.

PGD (preimplantation genetic dignosis) is a procedure that helps identifying the fetus genetic defects and gives an option to the parents if they want to carry on or not with the pregnancy if complications appear.