Effects of Trophectoderm (TE) Biopsy on the Health and Development of Children Born After Preimplantation Genetic Testing (PGT) Cycles.

Inclusion Criteria for Cases: * Child: Has completed the first year of life at the time of data collection. * Child: Does not have any pre-existing medical conditions that significantly affect growth (weight and height). * Mother: Able to provide informed consent for participation in the study. * Mother: Conceived between the ages of 18 and 43. * Mother: Achieved a singleton live birth with a single gestational sac. * Mother: Underwent a PGT cycle followed by FET. Inclusion Criteria for Controls: * Child: Has completed the first year of life at the time of data collection. * Child: Does not have any pre-existing medical conditions that significantly affect growth (weight and height). * Mother: Able to provide informed consent for participation in the study. * Mother: Conceived between the ages of 18 and 43. * Mother: Achieved a singleton live birth with a single gestational sac. * Mother: Underwent only FET. Participants will be excluded from this study if they meet any of the following criteria: * Mother: Unable or unwilling to sign the informed consent. * Mother: Has undergone a fresh embryo transfer. * Child: Missing birth weight or length/height data.