Bulma is pregnant with Trunks before the Cell saga in DBZ. We never see her pregnant.
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I think that the episode trunks show when he was a baby was episode 150 - 170.they first show trunks with sword and new born baby trunks in the episode when goku finally returns from the planet namek :)
yes in dragon ball season 1
No. Not in Dragon Ball GT. He only has a little sister
http://rule34.paheal.net/post/list/bulma_briefs/1
no she just has a temper like goku's wife.