Because of IVF, 2-3 embryos can be released at a time (whether 2 or 3 embryos are released depends on the age of the woman and the number of cycles of treatment with assisted reproductive technology), the chances of twins being born as a result of assisted reproductive technology are much higher than the chances of twins in a natural pregnancy. For the first IVF and the woman is younger than 35 years old, 2 embryos can be placed; for the second IVF or if the woman is older than 35 years old, 3 embryos can be placed.