I only heard that, during preggy, we have to eat all our preggy, so bb come out won't keep drooling. If not is the drooling ceremony during 4th month.
Anyway bb drool bcuz their are coming out teeth, not necessary mean use table cloth wipe their mouth they will stop drooling. We did 4 month ceremony, both also drooling when they are 1 and 2 years separately.