Patients that meet the eligibility criteria will be randomized prior to embryo transfer. In order to be randomized, the patient must have blastulated embryos suitable for biopsy on day 5. Half of the patients will received 24 chromosome PGD and will have 2 PGD normal embryos transferred. Half the the patients will receive no PGD and the 2 morphologically best embryos will be transferred. Follow up on pregnant patients will be a blood draw at approximately 9 weeks gestation and buccal swabs collected from the infant(s).