How can IVF help couples become pregnant?

When a couple try and conceive the traditional way, they only have a shot at fertalising one egg a month, as the woman will only release one egg a month. In IVF several eggs will be taken from a woman, and they will all be fertalised outside of the womb (in a kind of test tube). Usually not all of the eggs taken will successfully grow, but there is more of a chance that one will because there are more eggs to work with. Hopefully you might get a few really strong ones, and these are then placed inside the womb to continue with the pregnancy as normal. Again, not all the eggs will survive, but the hope is at least one will, so you will get a baby. Sometimes, all of the eggs continue to grow in the womb, and that's why IVF treatment has been linked to having twins and triplets.