This is a case by case discussion and agreement between both the Intended Parents and their Surrogate during the matching phase. It is always a good idea to never agree to transfer more embryos than babies you are willing to carry. For example, if you are only comfortable with carrying one baby, it is wise to only transfer one embryo. Occasionally an embryo can split resulting in twins, but that cannot be predicted. Being sure of how many babies you are willing to carry can greatly minimize the need for fetal reduction or termination that sometimes can occur with multiples pregnancies.