 The objective of this study was to investigate how the number of oocytes retrieved during an in vitro fertilization. IVF cycle affects the live birth rate, LBR, and multiple gestation pregnancy, MGP, rates. This retrospective observational longitudinal study included data from 172,341 attempts at fresher site retrieval cycles from 9,439 patients. The results showed that the LBR decreased significantly as the number of ocytes increased from 0 to 50 ocytes, with the lowest LBR seen in the zero ocyte group. Additionally, the MGP rate also decreased significantly as the number of ocytes increased from 0 to 50 ocytes, with the highest MGP rate seen in the zero ocyte group. These findings suggest that the number of ocytes retrieved should be kept within a certain range to maximize both LBR and MGP rates. This article was authored by Eric Giorniós, Guillem Bohadou, Roy Homburg, and others. We are article.tv, links in the description below.