Inclusion Criteria:  Inclusion criteria for the study would be women aged 35 - 42 years undergoing IVF ± ICSI for treatment of infertility Patients with 3 or more good quality embryos (assessed according to the embryo scoring system of the Association of Clinical Embryologists, UK) on day 3 following egg collection Ability to provide informed written consent  Exclusion Criteria:  Women undergoing preimplantation genetic testing for inherited genetic disorders Gamete donation cycles Untreated hydrosalpinges Untreated uterine pathology (eg: endometrial polyps, submucous fibroids, intramural fibroids > 5 centimetres in maximum diameter, intrauterine adhesions, uterine septa)