The number of embryos formed depends upon the age of the couple who are going for IVF, their response to the drugs and the particular combination of drugs that they are given. For women more than 40 years of age, the number of embryos would be four to five and for women less than 40 years old, the number of eggs would be two to three.
During my IVF procedure, my doctor had mentioned that we can get maximum three embryos transferred in one IVF cycle. My wife got 2 embryos transferred to her uterus and we fortunately had twin babies. IVF procedure helped us complete our family.