I unhesitatingly rule that it is performed on Shabbat. The gemara (Keritot 7b) explains the pasuk from Parshat Tazria – כי תזריע וילדה זכר – עד שתלד ממקום שמזרעת, namely that a mother is only tamei’a (ritually impure) from tumat leida (impurity that is created by the birth process) after vaginal birth, but not if she gave birth in any other manner. Elsewhere, based on the juxtaposition of the laws of tumat leida and brit mila, the Gemara (Shabbat 135a) connects the