Day 7 blastocysts have lower euploidy rates but similar sustained implantation rates as Day 5 and Day 6 blastocysts. Correlation between standard blastocyst morphology, euploidy and implantation: an observational study in two centers involving 956 screened blastocysts. Day 7 embryo, blastocyst, delayed development, euploidy, embryo biopsy, artificial intelligence Keywords: Day 7 embryo; blastocyst; delayed development; embryo biopsy; euploidy; artificial intelligence EN Day 7 embryo blastocyst delayed development embryo biopsy euploidy artificial intelligence 520 524 5 03/02/23 20230301 NES 230301 The advancement of I in vitro i culture media has improved the efficacy of ARTs in the treatment of infertility ([6]). [Extracted from the article]