Shalom, Zachor!

On erev Shabbos Parshas Bo, a Far Rockaway resident decided to bring a gift for his friend’s shalom zachar. He spent 35 minutes on the round-trip delivery route. The newborn’s dad was grateful for his friend’s effort but said, “I’m Sefardi. We don’t make shalom zachars. We make a Brit Yitzchak.”
Is there any connection between a shalom zachar, celebrated Friday night, and a Brit Yitzchak, which is a meal the night before the bris? Does it make sense to say, “We don’t make shalom zachars. We make a Brit Yitzchak instead”?
Based on a Tosfos studied recently, it actually does! The Gemara (Bava Kama 80a) relates that Rav, Shmuel, and Rav Assi visited either a bris milah or a Yeshua HaBen. What is a Yeshua HaBen? Yeshua means saving or salvation. Rashi opines it is a pidyon haben. The words saving and redemption are related. Tosfos disagrees. Tosfos suggests that a Yeshua HaBen is a party to thank Hashem and celebrate the fact that the mother and the baby survived childbirth. There is no source for making a shalom zachar in the Gemara. However, the Terumas HaDeshen suggests that this Tosfos and his explanation of the Gemara is the source for making a shalom zachar. In fact, now we know what the purpose of the shalom zachar is! It is to thank Hashem for the health of the baby and the mother. The Rema codifies this Terumas HaDeshen as practical halacha and says there is a custom to make a shalom zachar. It is interesting to note that according to this explanation, the shalom zachar can be made even if the baby is not present. The family members can still thank Hashem that everyone is well.