i had one & in addition to many of the things already mentioned, my sister (she's a potter) made a "belly bowl" & brought it. everyone got to carve "blessings" to me & the babe prior to glazing & firing it.
i have a belly bowl for each of my bellies & each babe got their 1st bath in them
we also did henna tattoo-ing on my belly & if the guests wanted one, they got one.