Cai J, et al. - Researchers performed a comparison of the newborns weight in singleton term birth following transfer of thawed blastocysts–frozen on either day 5 or day 6 after in vitro fertilization. They performed a retrospective study including 1444 frozen–thawed blastocyst transfer (FBT) cycles resulting in live singleton births, between Jan 2013 and Dec 2016. Findings revealed that day 6 FBT is associated with increased birth weight and contributes to the incidence of large-for-gestational-age (LGA) newborns in FBT.