Question: May one make a shalom zachar in a shul, or must it be in the house with the baby?
Short Answer: Ideally, a shalom zachar should only take place in the house of the newborn and with the baby present. However, if that is difficult, there is certainly room to be lenient and hold the shalom zachar in a shul or another location. Accordingly, if the parents of the newborn and the newborn are still in the hospital, some have the custom to still make a shalom zachar without them.